Midweight with Cushion A warm and extremely comfortable choice when conditions demand it, this fine gauge knitted sock provides mid level cushion density under your foot. True Seamless technology allows for an undetectable seam fusion for an Ultra smooth, invisible feel. Boot Sock Height Sits mid calf for added protection and warmth. A sturdy companion. See chart below if other heights may be better for you. Composition Designed and Knit in Vermont with 62% Merino Wool 36% Nylon 2% Lycra Spandex. The fast action wicking pulls moisture away from skin, so no more sweaty, stinky socks. The soft, breathable merino wool has fast drying, all weather performance that keeps you cool in the summer and warm in the winter. Guaranteed for Life Darn Tough's famous guarantee if these socks wear, tear, or develop holes, Darn Tough will replace them no questions asked. No strings. No conditions. Over the years, when you open your sock drawer this is the pair you'll keep grabbing first. 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. Material: 62% Merino Wool 36% Nylon 2% Lycra Spandex Material Composition: 62% Merino Wool 36% Nylon 2% Lycra Spandex Darn Tough's most versatile sock. Dense, resilient terry loop cushioning surrounds the calf, foot bottom, and toes. Elastic arch support for a snug, performance fit. Reinforced toe and heel for increased durability.