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Oura Ring 4 Sizing Kit
The Oura Ring Sizing Kit is the ideal way to find the perfect fit for your Oura Ring Gen 4. It’s a custom sizer that allows for you, and those around you, to find the ideal fit before purchasing.
In stock. Next day delivery available.
Buy now, pay later from £2.50/mo with
Free UK shipping over £50, free returns.
Key Benefits
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The perfect way to find your ideal fit.
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Ensures a properly fitting Oura Ring 4 for maximum comfort, accuracy, and overall experience.
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Receive a £10 gift card with your sizing kit purchase.
The Oura Ring 4 Sizing Kit allows you to find the ideal size before purchasing an Oura Ring 4. It allows you to try multiple sizes, wear for 24 hours, and find your most comfortable fit. Oura Ring 4 sizes are slightly different from standard ring sizes, so it is important to size. With a sizing kit purchase, you will receive a coupon code to use towards your Oura Ring 4 at checkout.
NOT STANDARD SIZING — Oura Ring 4 sizes are slightly different from standard ring sizes, so it is important to size yourself using our sizing kit and to follow the instructions provided. Oura Ring is available in sizes 6-13. There are no half sizes.
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 on your index finger, middle or ring finger.
HOW IT SHOULD FIT — Oura Ring 4 should fit securely and comfortably at the base of your finger. Your Oura Ring should not rotate as you go about normal daily tasks. We recommend wearing your ring sizer for at least 24 hours to confirm your best fit.
RECEIVE COUPON CODE — With a sizing kit purchase, you will receive a coupon code to use towards your Oura Ring at checkout. The coupon code amount equates to the cost of your sizing kit.
The Oura Ring integrates advanced technology with a deep understanding of wellness, offering a truly holistic approach to health tracking. Backed by an in-house team of over 20 PhDs, the rings were refined across four generations, each version smarter, lighter, and more durable than the last, trusted by millions of users worldwide. Its research-grade sensors, comparable to those used in sleep labs, provide highly accurate to ensure you get reliable insights for your wellbeing.
The ring also continuously fine-tunes your health data, delivering increasingly personalised feedback the longer it’s worn. Additionally, each Oura Ring is made from aerospace-grade titanium, one of the strongest materials on earth. Years of testing guarantee they're comfortable to wear and will last long– making them a reliable partner that powers your lifelong health journey.
Born in the happiest country in the world, Oura is the wellness brand behind the revolutionary Oura Ring and Oura App. Combining Finnish craftsmanship with cutting-edge technology, its mission is simple: to make health a daily practice. That’s why they created a tool that fits seamlessly into daily life, offering clear insights to support wellbeing. Empowering individuals to take control of their health, Oura guides everyone on their journey, helping them make informed decisions and lead better, healthier lives.
With our Healf Curation Process, we do the work for you. Shop with confidence knowing that every item has been tried, tested, and curated for you.
Learn more about each step—Brand Discovery, Expert Validation, and Community Testing—here.
Shipping
At Healf, we prioritize safe and fast delivery for all our customers. Our carefully selected couriers are Royal Mail and DPD.
UK standard delivery
Enjoy free standard delivery on orders above £50, this option usually requires 2-3 working days. If your order is under £50, this delivery option is available for £3.99.
Next working day
For when you need our products urgently, we offer next working day shipping for £5.99. For orders placed before 12.00, we will ship it the same day to ensure you receive your order the next working day.
International
International deliveries can take 7 working days, and up to 4 weeks. The cost is £22.99 for orders below £50, £49.95 for orders above.
Returns
If for any reason you are not satisfied with your order, we provide free 365-day UK returns for all our customers. To initiate your return, simply contact us at team@healf.com, and we'll send you a return slip and help arrange a collection. The item you return must be sent in the same condition as received and inside the original packaging. Once received, we will notify you via email.
For international returns, we unfortunately do not cover the cost. However, we work with an array of carriers and can offer self-posting returns for customers shopping from outside the UK.
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Frequently asked questions
Every product undergoes our Healf Curation Process. With it, you can shop confidently knowing that every item has been tried and tested before it reaches you. Our Healf Curation Process includes three key steps: Brand Discovery, Expert Validation, and Community Testing. Through these, we assess quality, ingredients, effectiveness, and more, ensuring that every product empowers your wellbeing.
The Healf Journal offers detailed insights into different aspects of wellbeing, as well as guidance, research, recipes, and more to help you invest in your personal wellbeing journey. You can also subscribe to our weekly newsletters for the latest updates at Healf and in the wellbeing industry. Subscribe via the sign-up block at the bottom of this page.
We love people who check ingredients as carefully as we do, so you'll find detailed information about the ingredients used on every product page (where applicable). If you see something you'd like to flag with us or have additional questions, please don't hesitate to get in touch—we'd love to hear from you.
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Translate your body’s data
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wellbeing plan.
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Healf Curation
Process™
Every product undergoes our rigorous Healf Curation Process, ensuring you are always getting the best when it comes to your wellbeing.
Discover more
The Discovery
Expert Validation
Community Testing