I wear an XL, but after reading these shrink in the wash, I decided to go with an XXL. It was definitely the right move, after one wash shirt shrunk down from an XXL to an XL. It fits well in the chest and arms and has extra space around the stomach. For reference, I am 6'2" and weigh 235.
If you have a more athletic build (bigger in the chest, arms, and shoulders), I would recommend ordering a size-up.