Pros FSA and HSA eligible Offers lots of data and insights that fitness watches don't Waterproof Come in two styles and multiple colors Cons A little bit pricey Comes with a monthly $5.99 membership In the words of Cosmo 's former shopping editor, Hannah Oh, who reviewed the Oura Ring 3 at length, this bad boy is "completely comfortable, charges super quickly, and provides extensive, easy-to-interpret data for anyone looking to dive deeper into understanding their sleep, exercise, stress, breathing, heart rate, and menstrual cycle." Moral of the story? Listen to Hannah and change your life! She also tested the Oura Ring 4 for an entire year and had equally as good things to say about it!…