--- product_id: 717690620 title: "Ring 4 Sizing Kit - Size Before You Buy Oura Ring 4 - Unique Sizing - Receive Credit for Purchase" brand: "oura" price: "€ 45.47" currency: EUR in_stock: true reviews_count: 6 category: "Oura" url: https://www.desertcart.be/products/717690620-ring-4-sizing-kit-size-before-you-buy-oura-ring store_origin: BE region: Belgium --- # Fits fingers 4-15, no half sizes 10 credit towards purchase Precision sizing kit Ring 4 Sizing Kit - Size Before You Buy Oura Ring 4 - Unique Sizing - Receive Credit for Purchase **Brand:** oura **Price:** € 45.47 **Availability:** ✅ In Stock ## Summary > 💡 Nail your perfect fit before you buy—because precision matters! ## Quick Answers - **What is this?** Ring 4 Sizing Kit - Size Before You Buy Oura Ring 4 - Unique Sizing - Receive Credit for Purchase by oura - **How much does it cost?** € 45.47 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.be](https://www.desertcart.be/products/717690620-ring-4-sizing-kit-size-before-you-buy-oura-ring) ## Best For - oura enthusiasts ## Why This Product - Trusted oura brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **No Standard Sizes Here:** Oura Ring 4 uses exclusive sizing different from traditional rings—get it right the first time. - • **Size Before You Commit:** Try before you buy with a unique sizing kit that applies a $10 credit to your ring purchase. - • **Wear It All Day, Every Day:** Recommended 24-hour wear of the sizer to confirm a secure, non-rotating fit for real-life comfort. - • **Perfect Fit, Zero Guesswork:** Custom sizing ensures your Oura Ring 4 fits flawlessly for max comfort and data accuracy. - • **Universal Finger Compatibility:** Designed to fit any finger on either hand—ideal for index, middle, or ring fingers. ## Overview The Oura Ring 4 Sizing Kit is a precision tool designed to help you find the exact fit for your Oura Ring 4, which uses unique sizing different from standard rings. It supports sizes 4 through 15 without half sizes and works on any finger. Using the kit ensures optimal comfort and the highest accuracy in health tracking data. Plus, purchasing the kit grants a $10 credit towards your ring, making sizing risk-free and smart. ## Description The Oura Ring 4 Sizing Kit allows for you and those around you to find the ideal fit before purchasing. With a sizing kit purchase, a 10 credit will automatically be applied to your Oura Ring 4 at checkout. A properly fitting Oura Ring 4 will result in the highest possible data accuracy, comfort, and overall experience. Oura Ring 4 sizes are slightly different from standard ring sizes, so it is important to size yourself using our tools and to follow our sizing instructions. 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. Review: Good - Good Review: かぶれた - 後で判明したがアマゾンとその他で1000円近く値段が違う。類似の商品にも出て来なかった。 ２４時間装着とあったので着けて寝たら、かぶれでしまった。本商品とは素材が違うが、高いので怖くて買えない ## Features - 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 - SIZE BEFORE YOU BUY - Oura Ring 4 sizes are different from standard ring sizes. Size yourself with the Oura Ring 4 Sizing Kit. For additional details, see “From the brand” section below - NOT STANDARD SIZING - Oura Ring 4 sizes are slightly different from standard ring sizes, so it is important to size yourself using our Oura Ring 4 Sizing Kit. Oura Ring 4 is available in sizes 4-15. 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 4 on your index, middle, or ring finger. Size the exact finger you plan to wear your Oura Ring 4 on - HOW IT SHOULD FIT - Oura Ring 4 should fit securely and comfortably at the base of your finger. Your 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 ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0D9WVWXR1 | | Additional Features | Unique Sizing Kit with Fit Credit | | Band Material Type | Stainless Steel | | Best Sellers Rank | #42,500 in Fashion ( See Top 100 in Fashion ) #53 in Ring Sizers | | Brand | OURA | | Built-In Media | Oura Ring 4 Sizing Kit | | Cellular Technology | Not supported | | Color | Sizing Kit | | Colour | Sizing Kit | | Compatible Devices | Smartphone | | Compatible Phone Models | Compatible with iOS and Android devices | | Customer Reviews | 4.5 out of 5 stars 3,620 Reviews | | Display Type | No Display | | GPS | No GPS | | GPS Geotagging Functionality | No GPS | | Human Interface Input | Unknown | | Manufacturer | Oura | | Metrics Measured | Heart Rate, Sleep Duration | | Model Number | JZ98-54870 | | Shape | Round | | Special features | Unique Sizing Kit with Fit Credit | | Style | Sizing Kit | | Style Name | Sizing Kit | | Supported Application | Fitness Tracker | | Unit Count | 1 Count | | Water Resistance Depth | 100 Meters | | Water Resistance Level | Waterproof | | Wearable Computer Type | Smart Ring | ## Product Details - **Brand:** OURA - **GPS:** No GPS - **Shape:** Round - **Special features:** Unique Sizing Kit with Fit Credit - **Style:** Sizing Kit ## Images ![Ring 4 Sizing Kit - Size Before You Buy Oura Ring 4 - Unique Sizing - Receive Credit for Purchase - Image 1](https://m.media-amazon.com/images/I/518Qh+G3I5L.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Good *by S***R on 2 July 2025* Good ### ⭐⭐ かぶれた *by A***ー on 9 September 2025* 後で判明したがアマゾンとその他で1000円近く値段が違う。類似の商品にも出て来なかった。 ２４時間装着とあったので着けて寝たら、かぶれでしまった。本商品とは素材が違うが、高いので怖くて買えない ### ⭐⭐⭐⭐⭐ As described. *by A***R on 24 February 2026* Ring size kit was perfect for figuring out my Oura ring size. ## Frequently Bought Together - Oura Ring 4 Sizing Kit - Size Before You Buy Oura Ring 4 - Unique Sizing - Receive Credit for Purchase - Oura Ring Gen3 Sizing Kit - Size Before You Buy The Oura Ring Gen3 - Unique Sizing - Receive Credit for Purchase - RingConn Gen 2 Air Sizing Kit - Size First Before You Buy - Choose from 9 Sizes - Sizes 6 to 14 - Only Smart Ring --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.be/products/717690620-ring-4-sizing-kit-size-before-you-buy-oura-ring](https://www.desertcart.be/products/717690620-ring-4-sizing-kit-size-before-you-buy-oura-ring) --- *Product available on Desertcart Belgium* *Store origin: BE* *Last updated: 2026-09-26*