Look out Oura! Smart ring rival Circular is back with what it attests is not only the world’s thinnest and lightest health ring, but the slimmest and lightest wearable per se. The follow-up to the Circular Ring Pro enters an increasingly competitive smart ring market, but distinguishes itself at just 2.2mm thick, while barely registering on the scales at 2 grams. However, cutting the footprint doesn’t mean any of the precision sensors for health and fitness tracking are absent.
