Ultrahuman Ring AIR – World’s lightest Sleep-Tracking Wearable, HRV, Heart Rate & Temperature Monitoring, Track Sleep, Movement & Recovery, Water Resistant up to 100 m, 6 Days Battery Life

Sizes: Available in 7 sizes from 6-12
Lightest wearable: As light as 2.4 grams
Build to last: Made with the robustness of Fighter Jet grade Titanium & coated with Tungsten Carbide