I ordered 3 XL shirts and all 3 looked and felt like XXL's. I washed and dried them on HOT and they are all now the appropriate size. Only worn them a handful of times but no complains other than the original size.
This shirt compares to the 511 shirts used by law enforcement. It was easy to use with HTV, pressed well. So far the decals are holding up good. I purchased 2 and they work great.