Fit me a little tight, so I returned it.  This was an authentic "The Mountain" shirt, but there are a lot of knock offs out there.  Be careful when purchasing.  If there is more than a 5 day shipping/receipt time, it is coming from China and is an illegal product.  I got burned before.  If this ever happens to you, make sure you look up The Mountains phone number in the internet, call them and let them know who you bought it from so they can contact Amazon and shut the seller down.