96% polyester/4% Elastane ; smooth anti-pick anti-pill fabric is extremely breathable and lightweight; qucik-dry for all day comfort; material wicks sweat and dries really fast; anti-odor technology prevents the growth of odor causing microbes; UPF 30 protects your skin from the sun's harmful rays; loose fuller cut for complete comfort; 4-way stretch construction moves better in every direction; self fabric collar