Ultrahuman Ring

Ultrahuman Ring Air Not sold in the US: a 2025 import ruling in Oura's patent case keeps it off American shelves, so US readers should look at the Ring Pro instead. Elsewhere it is one of the lighter rings you can buy, at 2.4 to 3.6 grams and 2.45 to 2.8 mm thick, in sizes 5 to 14 with a free sizing kit. Ultrahuman lists it at $349 with no recurring fee to see your data; its Max membership, from $9.99 a month, is optional. The cost is battery: Ultrahuman rates it at four to six days, the shortest here after the Helio, so expect to charge it at least weekly.