If you're considering purchasing one-a these tees, then you probably know what RFN means... it's a modern, texty take on the proverbial 'seize the day' thing. Now if you're inquiring about 'Id Protinus,' you're gonna have to brush up on your Latin. Regardless, this tee was designed to spread good vibes, spark optimism, and get folks going... the fact that it's printed on a comfy indigo blue 100% cotton tee will make any effort feel even more positronic. If you're worried about how this will fit your particular bod... check out our size charts accessible from the home page pull-down menus. Like, right now.