88% POLYESTER/12% ELASTANE. SMOOTH, SOFT FABRIC IS EXTREMELY BREATHABLE & LIGHTWEIGHT. 4-WAY STRETCH CONSTRUCTION MOVES BETTER IN EVERY DIRECTION. MATERIAL WICKS SWEAT & DRIES REALLY FAST. ANTI-ODOR TECHNOLOGY PREVENTS THE GROWTH OF ODOR-CAUSING MICROBES. UPF 50+ PROTECTS YOUR SKIN FROM THE SUN'S HARMFUL RAYS. SELF- FABRIC COLLAR WITH 3 BUTTON PLACKET. UA LOGO BACK YOKE.