"The Oura Ring 4 is available in six finishes: silver, black, brushed silver, stealth, gold and rose gold. But some finishes cost more than others. While silver and black are available at the $349 (£349, AU$569) starting price, brushed silver and stealth cost $399, and gold and rose gold are $499."

For the greater part of this past summer, I wore six smart rings at once. I wanted to see which was best, and the Oura Ring Gen 3 was the clear winner. Well, it’s been about two weeks since my experiment ended, and there’s now a new winner: the Oura Ring 4.

The big deal isn’t the sensors but how they can keep track of your vitals. One of the biggest updates to the Oura Ring 4 is the new Smart Sensing platform. Now boasting 18 signal pathways—more than double the eight pathways the Gen 3 used—the Ring 4 promises greater accuracy, even if the ring rotates up to 30% on your finger.