I hate those shirts with passion. They were cool when they first came out but damn everyone wears one now. I swear you should have to fill out paper work, send in a pic of yourself then wait 6 weeks to be approved to wear one. I cant stand it when I see a guy with 12inch arms wearing one. I have my arms at over 18 inches and still wont wear one because I dont want people staring at me because I'm still out of shape. I sorry to tell you that shirt's not gonna make you lift any heavier, run any faster or jump any higher, just makes you look like a dumbass. So unless your big and cut, dont wear one. Sorry I had to rant about it, saw one of those guys in the gym this morning.