Sizing a smart ring has always been a gamble. Too loose, and you risk losing it; too tight, and it’s unwearable. Some brands, such as Oura, tried to address this issue by providing sizing ...
The Circular Ring 2 is priced at $549 (AUS and UK tbc), but ... system that lets you use a smartphone to measure your ring size before ordering. It's a far cry from the plastic sizing kits of ...