Under Armour Performance Tech Crew Socks These aren't just any old socks. They keep your feet cool. They give you arch support. They've even got anti-odor technology so they don't stink. These are socks built for athletes. Durable material wicks sweat & dries really fast. New Locked-In Fit design keeps sock securely on heel for an adjustment-free fit. Medium cushioning throughout foot for comfort & protection. Mesh panels on top of foot for added breathability. Built-in arch support helps reduce foot fatigue. 3 pairs of socks per pack. 98% Polyester / 2% Elastane.