With the Oura Ring 5, you learn more about your daily health and you can improve your lifestyle. You get to know more about your sleep pattern, your daily movement, and your stamina. You can find all this information in the Oura app on your smartphone. The Oura Ring 5 is narrower and thinner than its predecessor. That way, it fits more comfortably and you barely feel it. Thanks to the improved sensors, all readings are even more accurate. Order a sizing kit before you order the Oura Ring 5. That way, you're sure you get the right size. You'll receive the price of the sizing kit in your account as CoolblueCredit. You can use this credit when you buy the Oura Ring 5 from us.