• Oura Ring 4 SIZING KIT - The Oura Ring 4 Sizing Kit is the ideal way to find the perfect size. It’s a custom sizer that allows for you, and those around you, to find the perfect fit before purchasing
• RECEIVE £10 CREDIT - With a sizing kit purchase, receive a £10 Amazon credit towards the future purchase of an Oura Ring 4. Sizing kit is not returnable (terms and conditions apply)
• ACCURACY - SMART SENSING - Oura tracks over 30 biometrics, including sleep, activity, stress, heart health, and women’s health metrics. Oura Ring 4 is powered by Smart Sensing, which adapts to you — delivering accurate, continuous data, day and night
• COMFORT AND ACCURACY - A properly fitting Oura Ring will result in the highest data accuracy, comfort, and overall experience
• CHOOSE A FINGER - Oura Ring 4 works on all fingers and can be worn on either hand. For optimal accuracy, we recommend wearing your Oura Ring 4 on your index, middle, or ring finger. Size the exact finger you plan to wear your Oura Ring 4 on

From the manufacturer

Find the right fit

Oura Ring 4 sizes are different than standard sizes. The Oura Ring 4 Sizing Kit is the best way to ensure a comfortable and accurate experience.

Step 1:

Purchase an Oura Ring 4 Sizing Kit and receive a £10 credit towards your Oura Ring.

Step 2:

Advanced health monitoring capabilities, including heart rate, sleep patterns, and activity tracking.

Step 3:

Slip on your Oura Ring 4 and download the Oura App.

Step 4:

New members get the first month of Oura Membership free, then it’s £5.99 per month.

Oura Ring

1. Size before you buy

   The Oura Ring 4 Sizing Kit is the best way to ensure an accurate experience.

2. Easy to wear, everywhere

   Sleek and comfortable, Oura Ring seamlessly fits into your life from a workout to a night out.

3. No interruptions

   Stay present without notifications on your wrist. Check the Oura App when you want to.

4. Built to last

   Oura Ring 4 is fully titanium: one of the strongest metals on earth. Durable, lightweight, and water resistant.

5. More accurate. More personal.

   Oura Ring 4 delivers incredibly accurate data and personalised health insights to help you be at your best.

A really smart gift.

The Oura Ring 4 Sizing Kit makes the perfect gift for your loved ones who want an Oura Ring 4 but you may not know their Oura Ring 4 size.