I really liked this shirt, but sizes were off. I was able to compare these to a Gildan 50/50 for reference. Youth sizes small, medium and large are correct. Youth XL P&C is the same size as an adult S Gildan Small P&C = Medium, Medium P&C = large. The large size P&C shirt is in between (I call it a large and a half) the XL matches the Gildan XL. So basically size down if you want adult S, M or large. Hope that helps! We used these for shooting shirts and they were a hit with the players. We had black. They may be more see through in lighter colors. We will likely make this out go to shirt.