Cant beat the X-Temp blend. I sweat a lot so its gotta go. The x-temp allows you to sweat but not pit out and if you do it evaps fast. Also a great base layer for cold weather layering. If you have big lats or wide shoulders you might be a little tight in the pits like me (mostly why I sweat) but your chest and arms will look great from the fit. I have probably 20 Hanes X-Temp tees in L and XL.