As someone who has never liked the look of smartwatches, I was excited to try out the Oura Ring 4 and use it to track my sleep. The wearable was so comfortable, I often forgot I had it on.
That's at least in part due to the device's new sensors, which are significantly smaller than those of its predecessor. The third-generation Oura has sensors that are raised and feel like little bumps, while those on the Ring 4 are basically flat, giving it a smooth interior like any other ring.