The only reason for a 4, and not a 5 is that I have 8 full wedge shirts and ordered my normal size (XL). When it arrived it was 1 inch narrower through the chest and waist than all previous shirts. Exchange process was great and received the size up quickly.
Great shirt but fits a little small. You might want to go up a size.
Great fit, super comfy!
Great fit! My friend and I bought matching for a tournament and received a lot of compliments.