Bought a pack of these last time they were on sale and love them. Wearing one right now. They’re great to sleep in since I’m a sweaty beast and they wick moisture very well and also don’t hold a stench. In for another set. One of the best recent Woots I’ve gotten (though the Warrior jackets are still the greatest so far).
These seem to run 1-1.5 smaller than stated size and, in my opinion, too short for working out in. With your arms above your shoulders, your naval will likely show. The material they are made of is nice but they just do not function for the reason I bought them, working out.