Ultrahuman Ring AIR Size Guide: Sizes & Two-Night Fit Test
Ultrahuman Ring AIR sizing explained: available sizes, differences from standard rings, preferred fingers, and the recommended two-night fit test.
5–14, whole sizes only
Important differenceUltrahuman says Ring AIR sizing differs from standard market sizes and other smart-ring brands, so an ordinary jewellery size is not a reliable direct conversion.
Our sizing recommendation
Use Ultrahuman’s sizing kit on an index, middle, or ring finger. Keep the best candidate on for at least two nights and confirm that it stays snug without discomfort.
Smart rings contain sensors and have a different inner profile from conventional jewellery. A calibrated jewellery measurement can provide a starting point, but the manufacturer’s own sizing kit is the final authority.
Use the correct Ultrahuman Ring AIR sizing kit.
Check the generation before ordering: smart-ring sizing kits are not universally interchangeable.
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Fact checked against Official Ultrahuman sizing-kit guide. Brand names belong to their respective owners. RingSize.app is independent and is not endorsed by the manufacturer.