---
product_id: 724839096
title: "Oura Ring 4 Size Kit - Size Before You Buy Oura Ring 4 - Unique Size, Not Standard US Ring Size - You Will Receive Your Purchase Credit"
price: "S$34"
currency: SGD
in_stock: true
reviews_count: 3
url: https://www.desertcart.sg/products/724839096-oura-ring-4-size-kit-size-before-you-buy-oura
store_origin: SG
region: Singapore
---

# Optimizes Oura Ring 4 data accuracy Custom sizing kit for perfect fit Fits all fingers & both hands Oura Ring 4 Size Kit - Size Before You Buy Oura Ring 4 - Unique Size, Not Standard US Ring Size - You Will Receive Your Purchase Credit

**Price:** S$34
**Availability:** ✅ In Stock

## Summary

> 📏 Nail your perfect fit before you commit!

## Quick Answers

- **What is this?** Oura Ring 4 Size Kit - Size Before You Buy Oura Ring 4 - Unique Size, Not Standard US Ring Size - You Will Receive Your Purchase Credit
- **How much does it cost?** S$34 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.sg](https://www.desertcart.sg/products/724839096-oura-ring-4-size-kit-size-before-you-buy-oura)

## Best For

- Customers looking for quality international products

## Why This Product

- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Unlock Peak Accuracy:** Proper fit maximizes heart rate, activity, and sleep tracking precision.
- • **Smart Purchase Credit:** Size kit purchase applies credit toward your Oura Ring 4 order.
- • **Seamless Sizing Experience:** Try the size kit for 24+ hours to guarantee comfort and secure fit.
- • **Precision Fit, Zero Guesswork:** Custom sizing ensures your Oura Ring 4 fits perfectly before you buy.
- • **Universal Finger Compatibility:** Wear your Oura Ring 4 on any finger, any hand, with confidence.

## Overview

The Oura Ring 4 Size Kit is a specialized tool designed to help you find the exact ring size unique to Oura’s sizing system, which differs from standard US ring sizes. By ensuring a precise fit, it enhances the accuracy of health metrics like heart rate, activity, and sleep monitoring. Compatible with all fingers and both hands, the kit allows you to test comfort and fit over 24 hours before purchasing your Oura Ring 4, with a purchase credit applied toward your ring order.

## Description

With the Oura Ring 4 Size Kit, you and those around you will find the perfect fit before purchasing. When you purchase the sizing kit you will automatically apply 10 credits to the Oura Ring 4 at checkout. Proper fit of the Oura Ring 4 ensures the highest possible data accuracy, comfort, and overall experience. Oura Ring 4 size is slightly different from the standard ring size, so it is important to use our tool to adjust your size and follow the size instructions. Oura Ring 4 works on all fingers and can be worn on either hand. For optimal accuracy, we recommend wearing the Oura Ring 4 on your index finger, middle finger, or ring finger

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
Review: Scam alert! 詐欺商品！お金の無駄なので注意してください - この商品は詐欺のようなものです。絶対に購入しないでください！価格が高すぎるうえに、説明にあるようなdesertcartのクレジットも一切もらえません。リング購入時のクレジットを期待して買いましたが、何も得られませんでした。完全にお金の無駄です。日本ではビックカメラやヨドバシカメラで無料のリングサイズ測定サービスがありますので、そちらを利用した方が良いです。この商品にはお金を使わないでください。 This product is a scam — avoid it! It’s completely overpriced and does not give you desertcart credit as advertised. I bought it expecting to receive credit toward my ring purchase but was unable to. Total waste of money. You can just go to a store for free sizing — in Japan, Bic Camera and Yodobashi Camera both offer ring sizing services for free. Don’t waste your money on this product.

## Features

- OURA RING 4 SIZE KIT - The Oura Ring 4 Size Kit is an ideal way to find the perfect size. Custom sizing allows you and those around you to find the perfect fit before purchasing
- SIZE BEFORE PURCHASING - Oura Ring 4 size differs from the standard ring size. Determine your size with the Oura Ring 4 Size Kit. See "From Brand" section below for more information
- NOT STANDARD SIZE - Oura Ring 4 sizes differ slightly from the standard ring size, so it's important to use our Oura Ring 4 Size Kit to determine your size. Oura Ring 4 is available in sizes 4-15. No half sizes
- COMFORT AND ACCURACY - Proper fit Oura rings bring you the best data accuracy, comfort, and overall experience
- CHOOSE YOUR FINGER - Oura Ring 4 works on all fingers and can be worn on either hand. For optimal accuracy, we recommend wearing the Oura Ring 4 on your index finger, middle finger, or ring finger. Fits the finger size you plan to wear the Oura Ring 4
- HOW TO FIT - The Oura Ring 4 fits securely and comfortably at the base of the finger. Do not spin the ring when performing normal daily tasks. We recommend wearing a ring sizer at least 24 hours to ensure the best fit

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D9WVWXR1 |
| Amazon Bestseller | #56,873 in Health & Personal Care ( See Top 100 in Health & Personal Care ) #158 in Standard Penis Rings |
| Color | Size Kit |
| Customer Reviews | 4.6 4.6 out of 5 stars (2,372) |
| Date First Available | October 15, 2024 |
| Item Weight | 50 g |
| Item model number | JZ98-54870 |
| Other display features | Wireless |
| Package Dimensions | 16.7 x 11.3 x 1.2 cm; 50 g |
| Special features | Heart Rate Monitor, Activity Tracker, Sleep Monitor |
| Whats in the box | Oura Ring 4 Size Kit |

## Product Details

- **Brand:** OURA
- **Color:** white
- **Included Components:** Oura Ring 4 Size Kit

## Images

![Oura Ring 4 Size Kit - Size Before You Buy Oura Ring 4 - Unique Size, Not Standard US Ring Size - You Will Receive Your Purchase Credit - Image 1](https://m.media-amazon.com/images/I/518Qh+G3I5L.jpg)
![Oura Ring 4 Size Kit - Size Before You Buy Oura Ring 4 - Unique Size, Not Standard US Ring Size - You Will Receive Your Purchase Credit - Image 2](https://m.media-amazon.com/images/I/51CzPCL9TxL.jpg)
![Oura Ring 4 Size Kit - Size Before You Buy Oura Ring 4 - Unique Size, Not Standard US Ring Size - You Will Receive Your Purchase Credit - Image 3](https://m.media-amazon.com/images/I/51d-W9BxrXL.jpg)
![Oura Ring 4 Size Kit - Size Before You Buy Oura Ring 4 - Unique Size, Not Standard US Ring Size - You Will Receive Your Purchase Credit - Image 4](https://m.media-amazon.com/images/I/71m9EcEY+tL.jpg)

## Customer Reviews

### ⭐⭐ かぶれた
*by A***ー on September 9, 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

### ⭐ Scam alert! 詐欺商品！お金の無駄なので注意してください
*by B***R on October 29, 2025*

この商品は詐欺のようなものです。絶対に購入しないでください！価格が高すぎるうえに、説明にあるようなAmazonのクレジットも一切もらえません。リング購入時のクレジットを期待して買いましたが、何も得られませんでした。完全にお金の無駄です。日本ではビックカメラやヨドバシカメラで無料のリングサイズ測定サービスがありますので、そちらを利用した方が良いです。この商品にはお金を使わないでください。 This product is a scam — avoid it! It’s completely overpriced and does not give you Amazon credit as advertised. I bought it expecting to receive credit toward my ring purchase but was unable to. Total waste of money. You can just go to a store for free sizing — in Japan, Bic Camera and Yodobashi Camera both offer ring sizing services for free. Don’t waste your money on this product.

### ⭐ 笑った
*by ご***郎 on March 30, 2025*

サイズキットに1〜2万円？（2025年3月30日） ふざけるな 笑

## 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.sg/products/724839096-oura-ring-4-size-kit-size-before-you-buy-oura](https://www.desertcart.sg/products/724839096-oura-ring-4-size-kit-size-before-you-buy-oura)

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-02-03*