1. Introduction to the OURA Ring Gen3 Sizing Kit
The OURA Ring Gen3 Sizing Kit is designed to help you determine the optimal ring size for your OURA Ring Gen3. Achieving a proper fit is crucial for ensuring the highest possible data accuracy, comfort, and overall experience with your OURA Ring. Please note that OURA Ring Gen3 sizes are unique and differ from standard US ring sizes.

Image: The OURA Ring Gen3 Sizing Kit, containing multiple plastic sizer rings.
2. Setup: Preparing to Size Your OURA Ring Gen3
Before purchasing your OURA Ring Gen3, it is essential to use this sizing kit. The kit includes a range of plastic sizer rings (sizes 6-13, no half sizes) to help you find your perfect fit.
2.1 What's in the Box
- Oura Ring Sizing Kit (containing plastic sizer rings in sizes 6-13)
2.2 Initial Steps
- Open the OURA Ring Gen3 Sizing Kit box.
- Familiarize yourself with the different sizer rings provided.
- Identify the finger on which you intend to wear your OURA Ring Gen3. For optimal accuracy, the index finger is recommended, but the ring can be worn on any finger of either hand.

Image: Contents of the OURA Ring Gen3 Sizing Kit, showing the various plastic sizer rings.
3. Operating Instructions: Finding Your Perfect Fit
Follow these steps carefully to ensure you select the correct size for your OURA Ring Gen3:
- Try on Multiple Sizes: Begin by trying on several sizer rings to get a general idea of which sizes might fit your chosen finger.
- Wear for 24 Hours: Once you've narrowed down to a comfortable size, wear that plastic sizer ring for at least 24 hours. This allows you to experience how the ring feels throughout a full day, including during sleep, activity, and changes in body temperature, which can affect finger size.
- Check for Proper Fit: A properly fitting OURA Ring Gen3 sizer should:
- Fit securely and comfortably at the base of your finger.
- Not rotate excessively as you go about normal daily tasks.
- Be snug enough not to fall off, but not so tight that it causes discomfort or restricts circulation.
- Allow for easy removal over your knuckle, but with a slight resistance.
- Optimal Finger Placement: For the most accurate data collection, OURA recommends wearing the ring on your index finger. Ensure you size the exact finger you plan to wear your actual OURA Ring Gen3 on.

Image: A hand trying on a plastic sizer ring to check for comfort and fit.

Image: A hand wearing a plastic sizer ring, demonstrating how it should sit on the finger.
3.1 Important Sizing Considerations
- Your finger size can fluctuate throughout the day due to temperature, activity, and hydration. Wearing the sizer for 24 hours helps account for these variations.
- OURA Ring Gen3 does not come in half sizes. If you find yourself between two sizes, consider which size feels more comfortable and secure during different times of the day. Remember, a snug fit is generally better for sensor accuracy.
- If your knuckle is significantly wider than the base of your finger, ensure the sizer can pass over the knuckle with some resistance but without excessive force. The ring should not feel loose once it's past the knuckle and resting at the base of your finger.
3.2 Official Product Videos
Video: "Oura Ring Gen3 | Which Size to Order" - This video provides visual guidance on how to properly use the OURA Ring Gen3 Sizing Kit to determine your correct ring size.
Video: "Obsessed is an understatement! Used the sizing guide and ordered the 9! Fits great!" - A user shares their positive experience using the OURA Ring Gen3 Sizing Kit to find their perfect fit.
4. Care & Maintenance
The plastic sizer rings are durable but should be handled with care. Keep them clean and dry. Avoid exposing them to extreme heat or harsh chemicals, which could deform the plastic.
- Clean the sizer rings with mild soap and water if necessary.
- Store the kit in a cool, dry place to maintain the integrity of the sizers.
5. Troubleshooting Sizing Issues
If you encounter difficulties in finding your ideal size, consider the following:
- Between Sizes: If one size feels slightly too tight and the next size up feels slightly too loose, try wearing both sizes for extended periods (e.g., one for a day, the other for the next day) to see which one provides more consistent comfort and stability. Remember, a snug fit is generally better for sensor accuracy.
- Finger Swelling: If your fingers tend to swell (e.g., in hot weather, after exercise, or in the morning), try sizing at different times of the day to find a size that accommodates these fluctuations without being too loose at other times.
- Knuckle Size: If your knuckle is significantly wider than the base of your finger, ensure the sizer can pass over the knuckle with some resistance but without excessive force. The ring should not feel loose once it's past the knuckle and resting at the base of your finger.
6. Product Specifications
| Feature | Detail |
|---|---|
| Model Number | JZ98-54794 |
| Package Dimensions | 5.79 x 5.63 x 1.02 inches |
| Item Weight | 3.52 ounces |
| Color | White (Sizing Kit) |
| Manufacturer | Oura |
| Included Components | Oura Ring Sizing Kit (plastic sizer rings) |
| Ring Sizes Available | 6-13 (no half sizes) |
7. Support & Warranty Information
For additional assistance or inquiries regarding your OURA Ring Gen3 Sizing Kit or the OURA Ring Gen3 itself, please refer to the official OURA support channels.
7.1 OURA Ring Purchase Credit
Upon purchasing the OURA Ring Gen3 Sizing Kit, you may be eligible to receive a $10 Amazon credit towards the future purchase of an OURA Ring Gen3. Please check the terms and conditions provided with your sizing kit or on the Amazon product page for details on how to redeem this credit.

Image: OURA Ring Gen3 Sizing Kit packaging highlighting the credit offer.
7.2 Contacting OURA Support
Visit the official OURA website for comprehensive support resources, FAQs, and contact information for customer service. You can also refer to the OURA Store on Amazon for product details and updates.
Note: This sizing kit is specifically for OURA Ring Gen3. It is not compatible with OURA Ring Gen4.





