Smartwatches aren’t for everyone. Maybe you don’t want to wear a screen-equipped gadget to bed, or you’re just after something that’s less obtrusive. Subtlety is where smart rings like the Oura Ring 4 shine, and Prime Day has knocked down its cost. It costs $296.65 ($52.35) from Amazon, which is both its best price and first significant discount.

And after spending months testing the Oura Ring and the Apple Watch for your Cosmo reading pleasure, I knew it was time to take things to the next level with a Very Serious Gadget—the WHOOP, a screen-free health and fitness tracker worn by Sha’Carri Richardson,

Amazon is hosting its annual Prime Day event, but for 2025, it is 4 days long (rather than 2). We're rounding up all of the best deals of the event so far and updating this article live with the cream of the crop.