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Oura Ring 4 Sizing Kit – Size Before You Buy – Unique Sizing Classification for Smart Rings – Receive Credit for Purchase
£12.60 Original price was: £12.60.£6.30Current price is: £6.30.
In stock
Short Product Overview
Ensure maximum accuracy and comfort for your Oura Ring 4 with this official Sizing Kit. This essential “Size Before You Buy” smart ring kit eliminates guesswork, guaranteeing the perfect fit for precise sleep tracking, heart rate monitoring, and activity metrics. Best of all, receive a £10 credit towards your subsequent Oura Ring purchase, making this the smartest first step to owning the ultimate biometric smart ring.
- Official Oura Sizing Kit: Contains all unique sizes for a perfect, custom fit.
- Credit Towards Purchase: Includes a £10 voucher applied to your future Oura Ring order.
- Maximized Accuracy: Guarantees optimal sensor placement for reliable health data collection.
- Unique Sizing Classification: Ensures consistent and comfortable fit across the day.
In stock
Shipping & Delivery
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Courier delivery under £30
Our courier will deliver to the specified address
2-3 Days
From £4.99
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Prime delivery
Our prime courier will deliver to the specified address
1-2 Days
From £12.99
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Manufacture Warranty 1 Year
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Free 30-Day returns





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Product Description
Unlock the Perfect Fit: Oura Ring 4 Sizing Kit for Smart Ring Wearers – Size Before You Buy & Get Credit Towards Your Purchase!
Eliminate guesswork and ensure maximum comfort and accuracy for your Oura Ring 4. This official Sizing Kit provides all the unique Oura sizes, allowing you to confidently determine your ideal fit before committing to the final purchase. A properly sized smart ring is crucial for accurate sleep tracking, heart rate monitoring, and activity metrics. Best of all, this Sizing Kit is essentially free: you receive a £10 credit to use on your subsequent Oura Ring purchase, making this the smartest first step to owning the ultimate smart ring.
Key Features
- Official Oura Ring Sizing Kit: Contains all available Oura Ring sizes for a perfect, custom fit.
- Unique Sizing Classification: Ensures optimal sensor placement for highly accurate biometric data collection.
- Size Before You Buy: Experience the fit across different times of the day before purchasing the final ring.
- Receive Credit: Includes a £10 credit/voucher towards your Oura Ring purchase.
- Essential for Accuracy: A correct fit is vital for reliable health and wellness tracking.
Important Information
- Kit includes multiple dummy sizes.
- Sizing Kit is non-refundable but includes a purchase credit.
- Ensure you wear the sizer for 24 hours to check comfort and sizing consistency.
Why Choose Think Assemble
- Quality Assurance: We guarantee only genuine, official Oura Sizing Kits are dispatched.
- Fast Shipping: Rapid dispatch ensures you find your perfect fit quickly.
- Dedicated Support: Our team is ready to assist with any questions regarding your Oura Ring sizing process.
Specification
Overview
| Weight | 45.4 g |
|---|---|
| Dimensions | 14 × 14 × 2.5 cm |
| Product Dimensions | 14 x 14 x 2.5 cm; 45.4 g |
| Date First Available | 1 Mar. 2025 |
| Manufacturer | Oura |
| Item model number | JZ98-54867 |
| Country of origin | China |
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39 reviews for Oura Ring 4 Sizing Kit – Size Before You Buy – Unique Sizing Classification for Smart Rings – Receive Credit for Purchase
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CleverShoper –
Nice to use at your leisure and get used to, get the best comfy fit as the ring is wider than a normal ring. Good ring sizer all round, I got it on sale so good value for money.
David –
Very nice ring sizing kit and the price came off the ring with no problems
sat nav tomtom –
The ring sizer is good for medium size but you have manly hands you are out of luck it goes to 15
Dr R –
Don’t risk guessing your size – I have used an Oura Ring 3 for over 3 years now and decided to upgrade. My Oura 3 size is a size 13, the Oura Ring 4 sizing kit showed I needed a size 12 for this ring, the fit is different. I purchased the Oura ring 4 in size 12 and it fits perfectly and very comfortable. Also this kit was £5 and gave me a £10 discount on the ring so a no brainer. Don’t risk getting the wrong size, get the kit and wear the plastic blank for 24hours – you can then be confident of the right size.
AJLondon –
The Oura Ring 4 Sizing Kit is an essential first step for anyone considering this innovative smart ring. It takes the guesswork out of finding your perfect fit, ensuring a comfortable and accurate wearing experience.Key Features:Comprehensive Sizing: The kit includes a wide range of sizes to accommodate various finger shapes and sizes.Easy-to-Use: Clear instructions and a simple sizing method make it easy to determine your correct ring size.Unique Sizing Classification: Oura’s unique sizing system ensures a precise fit specifically for their smart rings.Purchase Credit: The cost of the sizing kit is credited towards your Oura Ring 4 purchase, making it a worthwhile investment.Well-Packaged: The kit arrived well-packaged and organised, making it easy to find the right size.Overall:The Oura Ring 4 Sizing Kit provides a seamless and accurate way to find your perfect ring size. It’s a must-have for anyone considering purchasing an Oura Ring, ensuring a comfortable and enjoyable experience from the start.
Tricia –
If you are thinking of purchasing a smart ring, its best to make sure you buy the correct size. This sizing kit is an excellent way of making sure you have chosen the correct size ring for your finger.
Philip –
I have a few wearables that I’ve used for sleep monitoring, and thought that the Oura might help as it does extra monitoring that my watch/band doesn’t do…. the problem is that for people with larger fingers (like myself) can’t wear themKnowing I have larger fingers I went straight to the size 15, the largest size in the package and the largest that Samsung make, but on my right (dominant) hand it barely gets past the 2nd knuckle, and on my left hand it JUST fits below the knuckle so I can “sort of” bend the finger, but it’s far from comfortableIt’s meant to fit on the first 2 fingers, and since there’s no way it’s fitting on the middle fingers, it stops both fingers from bending with it sitting smack in the middle of the knuckle – the only finger it “sort of” fits on is my left ring finger, but then it’s only wearable for about 15-20 minutes before it begins to get uncomfortable and I’ve got to take it off, so there’s no chance of me wearing it overnight, let alone all dayMaybe if they make larger rings it will be worth it, but I can’t buy one because my fingers are just too chonky for their sizes
thinkassemble.co.uk Customer –
Excellent for ring sizing 4th generation auro ring – used the same kit in John Lewis
Elena –
Necessario
Il kit di misurazione è molto pratico. Misurare il dito prima di acquistare l’anello è semplice e preciso, così ho preso la misura giusta al primo colpo. Consigliato a chi vuole evitare errori e ottenere il massimo dall’Oura Ring
berpar91 –
Parfait
Parfait pour trouver la bonne taille de bagueUn conseil : Garder là au moins une journée
Robert –
Brak bonifikaty
Zestaw rozmiarów przyszedł terminowo, ale nie została uwzględniona bonifikata, dlatego ocena 1.
Digby –
Great idea
Perfect way to be sure of getting the correct size for my ring
Thanks2Oro –
Praktisches Sizing Kit
Hilfreich für die richtige Größenbestimmung. Kostenlos und gut gemacht. Spart Zeit und Geld.
CleverShoper –
Nice to use at your leisure and get used to, get the best comfy fit as the ring is wider than a normal ring. Good ring sizer all round, I got it on sale so good value for money.
David –
Very nice ring sizing kit and the price came off the ring with no problems
sat nav tomtom –
The ring sizer is good for medium size but you have manly hands you are out of luck it goes to 15
Dr R –
Don’t risk guessing your size – I have used an Oura Ring 3 for over 3 years now and decided to upgrade. My Oura 3 size is a size 13, the Oura Ring 4 sizing kit showed I needed a size 12 for this ring, the fit is different. I purchased the Oura ring 4 in size 12 and it fits perfectly and very comfortable. Also this kit was £5 and gave me a £10 discount on the ring so a no brainer. Don’t risk getting the wrong size, get the kit and wear the plastic blank for 24hours – you can then be confident of the right size.
AJLondon –
The Oura Ring 4 Sizing Kit is an essential first step for anyone considering this innovative smart ring. It takes the guesswork out of finding your perfect fit, ensuring a comfortable and accurate wearing experience.Key Features:Comprehensive Sizing: The kit includes a wide range of sizes to accommodate various finger shapes and sizes.Easy-to-Use: Clear instructions and a simple sizing method make it easy to determine your correct ring size.Unique Sizing Classification: Oura’s unique sizing system ensures a precise fit specifically for their smart rings.Purchase Credit: The cost of the sizing kit is credited towards your Oura Ring 4 purchase, making it a worthwhile investment.Well-Packaged: The kit arrived well-packaged and organised, making it easy to find the right size.Overall:The Oura Ring 4 Sizing Kit provides a seamless and accurate way to find your perfect ring size. It’s a must-have for anyone considering purchasing an Oura Ring, ensuring a comfortable and enjoyable experience from the start.
Tricia –
If you are thinking of purchasing a smart ring, its best to make sure you buy the correct size. This sizing kit is an excellent way of making sure you have chosen the correct size ring for your finger.
CK –
Good handy kit and gets you money off the ring anyway can’t go wrong.