The Under Armour All-Sport Cushion Sock features welt top construction that provides comfort and fit. 1x1 rib, knit-in arch support reduces foot fatigue while increasing blood circulation. Built-in vents maximize foot ventilation. Fully reciprocated toe construction with flat toe seam provide a perfect fit, while the full-cushion footbed adds maximum shock absorption and protection. 87% olefin/12% nylon/1% LycraŽ spandex. Made in USA.