One size fits most.  Decently expensive for what you're getting - the antlers don't stand up, and the ears make you look like a dog.  Trying to get into the suit is a nightmare.  I have broad shoulders, and the only way to get into the suit is to step into it from the neck opening - the opening was far too small for me to get my shoulders in.  If this is a one-and-done costume for you, feel free to buy it.  If you're anything like me, you'll get the suit up to your ripcage, and realize you're gonna have to tear a bigger hole - and a second one to use the bathroom without having to take the entire costume off.