---
product_id: 717690620
title: "Ring 4 Sizing Kit - Size Before You Buy Oura Ring 4 - Unique Sizing - Receive Credit for Purchase"
brand: "oura"
price: "¥3816"
currency: JPY
in_stock: true
reviews_count: 7
category: "Oura"
url: https://www.desertcart.jp/products/717690620-ring-4-sizing-kit-size-before-you-buy-oura-ring
store_origin: JP
region: Japan
---

# Credit applied on purchase Custom sizing precision Reusable for multiple fingers Ring 4 Sizing Kit - Size Before You Buy Oura Ring 4 - Unique Sizing - Receive Credit for Purchase

**Brand:** oura
**Price:** ¥3816
**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?** ¥3816 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/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

- • **Smart Savings:** Receive a $10 credit toward your Oura Ring 4 purchase when you buy the sizing kit.
- • **24-Hour Fit Test:** Wear the sizer for a full day to confirm a secure, no-slip fit during daily activities.
- • **Wear It Your Way:** Fits all fingers on either hand—optimize accuracy by sizing your preferred finger.
- • **Size Before You Commit:** Avoid guesswork with a dedicated sizing kit tailored to Oura Ring 4’s unique scale.
- • **Perfect Fit, Every Time:** Custom Oura Ring 4 sizing ensures unmatched comfort and data accuracy.

## Overview

The Oura Ring 4 Sizing Kit is a precision tool designed to help you find the exact ring size for optimal comfort and sensor accuracy. Unlike standard rings, Oura Ring 4 sizes range from 4 to 15 with no half sizes, making this kit essential. It fits all fingers and includes a 24-hour wear test recommendation. Plus, purchasing the kit grants a $10 credit toward your Oura Ring 4, ensuring a confident, risk-free buy.

## 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: good - it is what it is

## 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 |
| Best Sellers Rank | #11,471 in Fashion ( See Top 100 in Fashion ) #28 in Ring Sizers |
| Item model number | JZ98-54870 |
| Manufacturer | Oura |
| Package Dimensions | 16.7 x 11.3 x 1.2 cm; 50 g |

## Product Details

- **Brand:** OURA
- **Colour:** Sizing Kit
- **Included components:** Oura Ring 4 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)

## Available Options

This product comes in different **Color, Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good
*by S***R on 2 July 2025*

Good

### ⭐⭐⭐⭐⭐ good
*by T***R on 25 January 2025*

it is what it is

### ⭐⭐ Review
*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

## 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

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**Shop now:** [https://www.desertcart.jp/products/717690620-ring-4-sizing-kit-size-before-you-buy-oura-ring](https://www.desertcart.jp/products/717690620-ring-4-sizing-kit-size-before-you-buy-oura-ring)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-15*