In honor of Prime Day, Amazon is going against the norm with the first-ever price cut on Oura Ring 4: With a 15% reduction on all sizes, you can now buy the Oura Ring 4 in silver, size 10, for $297 from $349. Other sizes are also on sale, but some of them are already sold out.

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.

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,