Do you have SKINNY arms?
Then this armor is for you. I ordered the XL and had to return it because the "interface" where the arms zip to the shoulders was too tight for my arms. I ordered the XXL thinking that obviously the arm opening/zipper area would be bigger. Guess what? Nope. I had to return the XXL as well. This must be a design flaw of the armor. It makes absolutly no sense at all. I'm actually really bummed out to write this review because the quality and breathabily of this armor seemed great. If you've got slightly larger than normal arms, this armor is NOT for you. If you've got normal to skinny arms, you should be okay.