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Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.

Get to know your body better with the Oura Ring 4. It's got discreet sensors that track your sleep, readiness, and daily activity. With an Oura Membership (sold separately), you can access features like in-depth sleep analysis, personalised health insights, and live heart rate monitoring. Whether you're cleaning the house or hitting the elliptical at the gym, it automatically detects your activity and gives you credits. Plus, the daily Readiness Score helps you decide when to push yourself or take it easy.Good to know- It's comfortable to wear day and night, thanks to its non-allergenic, lightweight titanium design- With a battery that lasts up to 8 days, you can go over a week without thinking about charging- You can go swimming or do water sports - it's water resistant down to 100 metres- Keep tabs on your daytime stress levels and learn how to build resilience over time- By monitoring your heart rate, you'll gain insights into your cardiovascular age and cardio capacity- Skin temperature tracking assists with illness detection and menstrual cycle insights______________________________________Please note:- To find the most comfortable fit, we recommend purchasing the Oura Ring 4 Sizing Kit. Sizing differs from Gen3 and standard ring sizes, so if you're switching rings or are unsure, use the correct kit. Wear the sizer for 24 hours to find your best fit.- Some tracking and insight features are only available with an Oura Membership (sold separately). Non-paying members have access to 3 simple daily scores: Sleep, Readiness, and Activity, as well as interactive and educational Explore content.