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…
