Polyester,Spandex,Nylon Made in the USA Ultra Lightweight with Cushion - Provides a light layer of cushioning along the bottom of the foot. Ultra-Light, ultra-comfortable. True Seamless technology allows for an undetectable seam fusion for an ultra-smooth, invisible feel. 1/4 Sock Height - Sits just above the ankle. The “just right” height that’s fast and light. Great for low-cut hikers and running shoes. Composition - Knit with 48% Coolmax Polyester 47% Nylon 5% Lycra Spandex. Coolmax is engineered to move moisture away from your skin and dry fast in warm conditions. Guaranteed for Life - If these socks wear, tear, or develop holes, Darn Tough will replace them. No strings. No conditions. Made in the USA - Every pair of socks is knit in Northfield, Vermont - the perfect testing ground for the finest premium all weather performance socks.