---
product_id: 661191227
title: "Oura Ring 4 Sizing Kit - Smart Ring Accessory - Before You Buy - Unique Sizing, Not Standard US Sizes - Receive Credit for Purchase - Compatible with Oura App, Android & iOS"
brand: "oura"
price: "€ 21.27"
currency: EUR
in_stock: true
category: "Oura"
url: https://www.desertcart.es/products/661191227-oura-ring-4-sizing-kit-smart-ring-accessory-before-you
store_origin: ES
region: Spain
---

# Instant $10 credit on purchase Precision sizing for perfect fit Seamless Oura app compatibility Oura Ring 4 Sizing Kit - Smart Ring Accessory - Before You Buy - Unique Sizing, Not Standard US Sizes - Receive Credit for Purchase - Compatible with Oura App, Android & iOS

**Brand:** oura
**Price:** € 21.27
**Availability:** ✅ In Stock

## Summary

> 📏 Fit it right, track it tight — your health’s new best friend.

## Quick Answers

- **What is this?** Oura Ring 4 Sizing Kit - Smart Ring Accessory - Before You Buy - Unique Sizing, Not Standard US Sizes - Receive Credit for Purchase - Compatible with Oura App, Android & iOS by oura
- **How much does it cost?** € 21.27 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.es](https://www.desertcart.es/products/661191227-oura-ring-4-sizing-kit-smart-ring-accessory-before-you)

## 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

- • **Save While You Size:** Get a $10 credit applied automatically towards your Oura Ring 4 purchase—smart shopping starts here.
- • **Universal Finger Fit:** Designed to fit any finger on either hand, maximizing your wearable flexibility.
- • **Find Your Perfect Fit:** Unique sizing tailored beyond standard US rings for unmatched comfort and accuracy.
- • **Effortless Compatibility:** Works flawlessly with both iOS and Android Oura apps for real-time insights.
- • **Optimize Your Health Data:** Proper sizing ensures the highest accuracy in heart rate, sleep, and activity tracking.

## Overview

The Oura Ring 4 Sizing Kit is an essential pre-purchase tool designed to help you find the perfect ring size, ensuring optimal comfort and data accuracy. It offers a unique sizing system distinct from standard US sizes, fits any finger on either hand, and comes with a $10 credit redeemable on your Oura Ring 4 purchase. Compatible with both iOS and Android devices, this kit guarantees you get the most precise heart rate, sleep, and activity tracking experience possible.

## 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.

## Features

- 173

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0D9WVWXR1 |
| Additional Features | Heart Rate Monitor, Activity Tracker, Sleep Monitor |
| Band Material Type | Stainless Steel |
| Best Sellers Rank | #68 in Electronics ( See Top 100 in Electronics ) #2 in Smart Rings |
| Brand | OURA |
| Built-In Media | Oura Ring 4 Sizing Kit |
| Cellular Technology | Not supported |
| Closure Type | Push Back |
| Color | Sizing Kit |
| Compatible Devices | Smartphone |
| Compatible Phone Models | Compatible with iOS and Android devices |
| Customer Reviews | 4.5 4.5 out of 5 stars (3,834) |
| Display Type | No Display |
| GPS Geotagging Functionality | No GPS |
| Manufacturer | Oura |
| Metrics Measured | Heart Rate, Sleep Duration |
| Model Number | JZ98-54870 |
| Shape | Round |
| Style Name | Sizing Kit |
| Supported Application | Fitness Tracker, Sleep Monitor |
| Unit Count | 1.0 Count |
| Warranty Description | 1 Year Manufacturer |
| Warranty Type | Limited |
| Water Resistance Depth | 100 Meters |
| Water Resistance Level | Water Resistant |
| Wearable Computer Type | Smart Ring |

## Product Details

- **Band Material Type:** Stainless Steel
- **Brand:** OURA
- **Color:** Sizing Kit
- **Compatible Devices:** Smartphone
- **Compatible Phone Models:** Compatible with iOS and Android devices
- **Display Type:** No Display
- **GPS:** No GPS
- **Shape:** Round
- **Special Feature:** Heart Rate Monitor, Activity Tracker, Sleep Monitor
- **Style:** Sizing Kit

## Images

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

## Available Options

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

## 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.es/products/661191227-oura-ring-4-sizing-kit-smart-ring-accessory-before-you](https://www.desertcart.es/products/661191227-oura-ring-4-sizing-kit-smart-ring-accessory-before-you)

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*Product available on Desertcart Spain*
*Store origin: ES*
*Last updated: 2026-07-13*