88% POLYESTER / 12% ELASTANE. UPF 50+. SMOOTH, SOFT FABRIC IS EXTREMELY BREATHABLE & LIGHTWEIGHT. 4-WAY STRETCH. MATERIAL WICKS SWEAT & DRIES REALLY FAST. ANTI-ODOR TECHNOLOGY PREVENTS THE GROWTH OF ODOR-CAUSING MICROBES. SELF-FABRIC COLLAR WITH 3 BUTTON PLACKET. UA LOGO ON BACK YOKE.