---
product_id: 661191227
title: "Ring 4 Sizing Kit - Size Before You Buy The Oura Ring 4 - Unique Sizing, Not Standard US Ring Sizes - Receive Credit for Purchase"
brand: "oura"
price: "S$19"
currency: SGD
in_stock: true
reviews_count: 13
category: "Oura"
url: https://www.desertcart.sg/products/661191227-ring-4-sizing-kit-size-before-you-buy-the-oura
store_origin: SG
region: Singapore
---

# Optimizes wearable sensor accuracy Custom sizing kit for perfect fit Credit applied toward ring purchase Ring 4 Sizing Kit - Size Before You Buy The Oura Ring 4 - Unique Sizing, Not Standard US Ring Sizes - Receive Credit for Purchase

**Brand:** oura
**Price:** S$19
**Availability:** ✅ In Stock

## Summary

> 📏 Nail your perfect fit before you commit—because precision is the new luxury.

## Quick Answers

- **What is this?** Ring 4 Sizing Kit - Size Before You Buy The Oura Ring 4 - Unique Sizing, Not Standard US Ring Sizes - Receive Credit for Purchase by oura
- **How much does it cost?** S$19 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/661191227-ring-4-sizing-kit-size-before-you-buy-the-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

- • **Fits Any Finger, Any Hand:** Designed for index, middle, or ring fingers on either hand—choose your optimal placement.
- • **Maximize Your Data Accuracy:** A perfect fit means your Oura Ring 4’s health sensors deliver the most precise insights possible.
- • **Smart Savings with Every Kit:** Sizing kit purchase automatically credits $10 toward your Oura Ring 4 order—size smart, save smart.
- • **Precision Fit, Zero Guesswork:** Custom sizing tailored exclusively for Oura Ring 4’s unique dimensions—no more standard size confusion.
- • **Wear It All Day, Test Your Comfort:** Try the sizer for 24+ hours to ensure seamless comfort during daily activities and sleep.

## Overview

The Oura Ring 4 Sizing Kit is an essential tool designed to help you find the exact ring size for the Oura Ring 4, which uses unique sizing different from standard US rings. By wearing the sizing kit for at least 24 hours, you ensure maximum comfort and data accuracy when using the actual ring. The kit fits all fingers and hands, and purchasing it grants a $10 credit toward your Oura Ring 4 purchase, making it a smart, risk-free step to owning the world’s most advanced health ring.

## 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: It does exactly what it says it does - It does exactly what it says it does. The rings are comfortable to wear and made it easy to figure out the right size before ordering the actual Oura Ring. I also appreciated being able to wear it for a full day to see how it felt during normal activities and while sleeping. Simple, accurate, and definitely worth using to avoid sizing issues
Review: Perfect fit - This was absolutely perfect to help me determine my ring size before buying the oura ring. The fit of the tester band was the exact same size as the oura ring. I loved that I was able to wear it for a day and try it out before buying the actual ring. I found this kit very helpful in finding the most comfortable size

## 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 | #350 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #2 in Ring Sizers |
| Color | Sizing Kit |
| Customer Reviews | 4.6 4.6 out of 5 stars (2,688) |
| Date First Available | October 3, 2024 |
| Item Weight | 1.76 ounces |
| Item model number | JZ98-54870 |
| Manufacturer | Oura |
| Other display features | Wireless |
| Package Dimensions | 6.57 x 4.45 x 0.47 inches |
| Special features | Heart Rate Monitor, Activity Tracker, Sleep Monitor |
| Whats in the box | Oura Ring 4 Sizing Kit |

## Product Details

- **Brand:** OURA
- **Color:** Sizing Kit
- **Included Components:** Oura Ring 4 Sizing Kit
- **Manufacturer:** Oura

## Images

![Ring 4 Sizing Kit - Size Before You Buy The Oura Ring 4 - Unique Sizing, Not Standard US Ring Sizes - Receive Credit for Purchase - Image 1](https://m.media-amazon.com/images/I/518Qh+G3I5L.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ It does exactly what it says it does
*by D***A on February 3, 2026*

It does exactly what it says it does. The rings are comfortable to wear and made it easy to figure out the right size before ordering the actual Oura Ring. I also appreciated being able to wear it for a full day to see how it felt during normal activities and while sleeping. Simple, accurate, and definitely worth using to avoid sizing issues

### ⭐⭐⭐⭐⭐ Perfect fit
*by S***H on February 13, 2026*

This was absolutely perfect to help me determine my ring size before buying the oura ring. The fit of the tester band was the exact same size as the oura ring. I loved that I was able to wear it for a day and try it out before buying the actual ring. I found this kit very helpful in finding the most comfortable size

### ⭐⭐⭐⭐⭐ Absolutely Essential Before Buying Your Oura Ring
*by N***E on February 14, 2026*

This sizing kit is hands down the best thing to purchase before ordering an Oura Ring. The sizing runs differently than regular jewelry, so trying the sample rings first made a huge difference in choosing the perfect fit. I loved being able to wear a size for a full day to see how it felt during normal activities, sleeping, and slight finger swelling. It gave me confidence that I was ordering the correct size and avoided the hassle of returns or exchanges. If you’re even slightly unsure about sizing, get this first. It’s a small step that saves time, stress, and money in the long run. Highly recommend! ⭐⭐⭐⭐⭐

## 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/661191227-ring-4-sizing-kit-size-before-you-buy-the-oura](https://www.desertcart.sg/products/661191227-ring-4-sizing-kit-size-before-you-buy-the-oura)

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*Product available on Desertcart Singapore*
*Store origin: SG*
*Last updated: 2026-03-01*