--- product_id: 728323895 title: "Oura Ring 4 Sizing Kit - Size Before You Buy Oura Ring 4 - Unique Sizing, Not Standard US Ring Sizes - Receive Credit for Purchase (FR/EN)" brand: "oura" price: "¥2572" currency: JPY in_stock: true reviews_count: 5 category: "Oura" url: https://www.desertcart.jp/products/728323895-oura-ring-4-sizing-kit-size-before-you-buy-oura store_origin: JP region: Japan --- # Optimizes data accuracy & comfort Custom sizing, not standard US sizes Fits all fingers, both hands Oura Ring 4 Sizing Kit - Size Before You Buy Oura Ring 4 - Unique Sizing, Not Standard US Ring Sizes - Receive Credit for Purchase (FR/EN) **Brand:** oura **Price:** ¥2572 **Availability:** ✅ In Stock ## Summary > 📏 Size smart, track smarter — don’t miss out on your perfect Oura fit! ## Quick Answers - **What is this?** Oura Ring 4 Sizing Kit - Size Before You Buy Oura Ring 4 - Unique Sizing, Not Standard US Ring Sizes - Receive Credit for Purchase (FR/EN) by oura - **How much does it cost?** ¥2572 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/728323895-oura-ring-4-sizing-kit-size-before-you-buy-oura) ## 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 - • **Wear It Your Way:** Designed to fit any finger on either hand for ultimate flexibility. - • **Save $10 Instantly:** Sizing kit purchase credits $10 toward your Oura Ring 4 order. - • **Try It 24/7 for Confidence:** Wear the sizer for a full day to confirm comfort and secure fit. - • **Perfect Fit, Zero Guesswork:** Custom sizing kit ensures you nail your Oura Ring 4 size before buying. - • **Boost Your Health Data Accuracy:** A snug fit means your ring’s sensors deliver peak performance. ## Overview The Oura Ring 4 Sizing Kit is a precision tool designed to help you find your exact ring size, as Oura Ring 4 uses unique sizing different from standard US rings. By ensuring a perfect fit on your chosen finger, it maximizes sensor accuracy and comfort. The kit fits all fingers and hands, and includes a $10 credit toward your Oura Ring 4 purchase, making sizing before buying effortless and rewarding. ## 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: Duurde lang voordat het aankwam en en geen 10 euro bon gekregen voor het kopen van de oura ring 4. Review: Oura Ring第3世代の電池持ちが悪くなってきたので、Oura Ring第4世代購入のためサイジングキットを購入した カラーはOura Ring第3世代と同じゴールド、第3世代は右人差指に着用してるので同じ指のOura Ring第4世代を購入予定です ## 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 - MATERIALS - Our sizing rings are made of plastic, while the Oura Ring 4 is crafted in full titanium for comfort. Due to the plastic mold used to make our ring sizers, they may seem less comfortable than the actual Oura Ring you’ll end up receiving. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0DWFSW47F | | Customer Reviews | 4.4 4.4 out of 5 stars (965) | | Date First Available | May 15, 2025 | | Item Weight | 0.019 ounces | | Item model number | JZ98-54867 | | Manufacturer | Oura | | Other display features | Wireless | | Product Dimensions | 5.51 x 5.51 x 0.98 inches | | Whats in the box | Oura Ring 4 Sizing Kit | ## Images ![Oura Ring 4 Sizing Kit - Size Before You Buy Oura Ring 4 - Unique Sizing, Not Standard US Ring Sizes - Receive Credit for Purchase (FR/EN) - Image 1](https://m.media-amazon.com/images/I/611YGgDMh9L.jpg) ![Oura Ring 4 Sizing Kit - Size Before You Buy Oura Ring 4 - Unique Sizing, Not Standard US Ring Sizes - Receive Credit for Purchase (FR/EN) - Image 2](https://m.media-amazon.com/images/I/71n+EP-FRyL.jpg) ![Oura Ring 4 Sizing Kit - Size Before You Buy Oura Ring 4 - Unique Sizing, Not Standard US Ring Sizes - Receive Credit for Purchase (FR/EN) - Image 3](https://m.media-amazon.com/images/I/71KwnBmYmIL.jpg) ## Customer Reviews ### ⭐ Review *by A***K on January 18, 2026* Duurde lang voordat het aankwam en en geen 10 euro bon gekregen voor het kopen van de oura ring 4. ### ⭐⭐⭐⭐⭐ Review *by ミ***ス on March 4, 2026* Oura Ring第3世代の電池持ちが悪くなってきたので、Oura Ring第4世代購入のためサイジングキットを購入した カラーはOura Ring第3世代と同じゴールド、第3世代は右人差指に着用してるので同じ指のOura Ring第4世代を購入予定です ### ⭐⭐⭐⭐⭐ Review *by C***R on December 17, 2025* 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. ## 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 for Heritage and Horizon Rings-Measure Sizes 6-13 for Fit Before Purchasing, Sizes are Unique to Oura --- ## 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.jp/products/728323895-oura-ring-4-sizing-kit-size-before-you-buy-oura](https://www.desertcart.jp/products/728323895-oura-ring-4-sizing-kit-size-before-you-buy-oura) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-04-24*