Find the perfect fit for your Ultrahuman Smart Ring. The sizing kit contains sample rings in sizes 5–14 as well as colour samples of all available variants to try on. Once you've chosen your preferred size, you can order the ring free of charge on Ultrahuman.com using the enclosed voucher code.

Available colours: Matte Grey, Aster Black, Bionic Gold, Space Silver, Raw Titanium

Available sizes: You can choose from a wide range of sizes from 5 to 14.

How to find your size:

• Try on the sample ring: For an accurate assessment, wear the ring so that the engraved size number faces the palm of your hand.
• IMPORTANT: Wear the ring for at least 24 hours to know whether it fits you properly.
• Find the right finger: For optimal comfort and advanced sleep tracking, we recommend wearing the Ultrahuman Ring AIR on your index, middle, or ring finger.
• Check the fit: If you rotate the ring on your finger, it should not turn freely.

Available ring colours: Samples of all available ring colours are visibly included in the sizing kit package.

Ordering your final ring: Afterwards, order the ring free of charge on Ultrahuman.com using the voucher code included in the package. Once you have placed your order at www.ultrahuman.com/ring/claim, the ring will be shipped to you at no cost.

This kit is valid for the ring colours Matte Grey, Aster Black, Bionic Gold, Space Silver, and Raw Titanium.

As a member of CSS insurance, you have received a discount code in advance which allows you to order the sizing kit at a reduced price in our shop.

To redeem the code:

1. Add the sizing kit to your cart.
2. At checkout, enter the CSS discount code in the "Discount code" field.
3. The reduced price will be applied automatically before payment.

After receiving the sizing kit, order the Ultrahuman Ring AIR free of charge on www.ultrahuman.com/ring/claim using the enclosed voucher code — as a CSS member, you benefit both from the discounted sizing kit and the free ring afterwards.

Ultrahuman Ring Air