The Under Armour Men's Tech Vent Short Sleeve T Shirt deliver lightweight mobility, everyday comfort, and streamlined athletic performance for training and active daily wear. The ultimate T for your hottest training days-it's loose, light, and has vented mesh panels throughout for maximum breathability. Plus, 4-way stretch fabric means you never have to slow down. Ultra-breathable knit fabric is super lightweight & comfortable Material composition includes 96% Polyester/4% Elastane. Notable features include Material wicks sweat & dries really fast; 4-way stretch material moves better in every direction; Underarm gusset provides enhanced mobility, ventilation & chafe-free performance.