Columbia Men's Performance Mesh Muscle Tee 85% Polyamide, 15% Spandex Imported Machine Wash Performance mesh muscle tee fabric is breathable, keeping you cool all day long. High durability and enhances air flow with no pilling Flat anti-chafing stitches. Tag free Antimicrobial treatment on fabric Omni-wick advanced evaporation pulls moisture away from the body and enables perspiration to evaporate quickly, keeping you dry and comfortable Athletic fit, wear for sports or daily comfort