LIGHTWEIGHT - Built light, darn comfy and super strong—substantial construction for a lightweight, sure fit. 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. See chart below if other heights may be better for you. COMPOSITION - Designed and knit in Vermont with 51% Merino Wool 45% Nylon 4% 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. In fact, many customers have said that they “threw away just about every other sock” they owned. 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. "Darn Tough socks are hands down the best pair of socks you'll ever wear, the first sock you'll reach for in your sock drawer, and the longest lasting sock you'll ever own. The performance fit means no slipping, no bunching, and no blisters. High quality fine gauge knitting ensures unprecedented durability and Darn Tough's unique ""put it on, forget it's on"" feel. Fast action wicking pulls moisture away from the skin, and undetectable seams are fused together for an ultra smooth, invisible feel. For almost 40 years, Darn Tough has been knitting premium socks in Northfield, Vermont. Crafting the world's most comfortable, durable, and best fitting socks is an ardent skill passed down from father to son for three generations."