The best fitness rings of 2025: Expert tested and reviewed

The Oura Ring is one of the most popular fitness rings on the market, offering five different finishes and various sizes. The Oura Ring 4 debuted in October and boasts some substantial hardware and software upgrades from the tried and true Oura Ring 3. Oura is still the top brand for smart rings, and you can't go wrong with the Oura Ring 3, but if comfort is your main priority, the Oura Ring 4 is best for you. That's because one of the most essential upgrades from generation to generation is Oura's smart sensing technology that allows for the raised sensor domes on the Oura Ring 3 to recede on the Oura Ring 4 -- and makes for a more continuous and accurate data capture. The Oura Ring 3 had eight signal pathways it used within the ring to gather data; the Oura Ring 4, on the other hand, upgraded that number to 18. Thanks to that signal pathway upgrade, there's more data to capture throughout the day and fewer gaps within the data. You can record your workout heart rate on the app and ... Read full article.