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The Under Armour All-Sport 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. Combination of olefin/nylon/spandex (varies by color). Imported. Sizing: S = Women's shoe size 1-4, Men's shoe size 3-6. M = Youth shoe size 10.5-13.5, Women's shoe size 7-10.5, Men's shoe size 4-8.5. L = Youth shoe size 1-4, Women's shoe size 11-13, Men's shoe size 9-12.5. XL = Men's shoe size 13-16.