On its website, Oura says users can prevent scratches by wearing the ring on their nondominant hand, keeping it separated from other rings and taking it off in high-friction scenarios such as weight lifting.

Despite this warning, I was surprised by how quickly the Ring 4 showed signs of wear, especially given its price tag. And no, scratches are not covered by Oura's warranty policy.

Another let down was the ring's battery life. It didn't last as long as Oura said it would.