Product DNA What's It Do? These are the go-to gym shirts for nearly every guy. The fabric dries fast to keep you cool and the streamlined fit cuts out any bulk or unnecessary material. It's also part of the UA MK-1 system — gear that all works together to give you what you need in any training situation. The Fundamentals Fitted: Next-to-skin without the squeeze HeatGear® fabric is ultra-soft & smooth with all-over jacquard texture for superior breathability Mesh back & underarm panels deliver strategic ventilation 4-way stretch construction moves better in every direction Material wicks sweat & dries really fast Shaped shoulder seam & hem 88% Polyester/12% Elastane Imported