UA Men's Heatgear Armour Short Sleeve CompressionSuper-light HeatGear® fabric delivers superior coverage without weighing you down. Mesh underarm & back panels for strategic ventilation. Material wicks sweat & dries really fast. Anti-odor technology prevents the growth of odor-causing microbes. Ergonomic design keeps seams off high abrasion areas & increases durability. Hybrid raglan sleeve construction for added range of motion & comfort.Write-in locker tag on back of neck for your initials or numberBody - 84% Polyester/16% ElastaneMesh - 92% Polyester/8% Elastane