55% US Merino wool, 43% US nylon, 2% US LYCRA Spandex U.S. Merino Wool: We source our 100% U.S. grown merino wool exclusively from sheep raised by American farmers on American farms. Merino wool keeps you cool in the summer and warm in winter. Targeted Light Cushion: High-density cushion targeting critical performance areas throughout the sock. 3/4 Crew: A slightly shortened crew that fits just below the calf but above a hiking boot Seamless Toe Closure: Advanced knitting techniques create a totally flat connection in the toe box, reducing bulk and eliminating blister-generating friction. Durability Assured: Reinforced construction and low-stress seam placement reduce wear and tear, increasing the life of the sock. At the crossroads of some of the most scenic trails in America, the little Virginia town of Damascus inspired our most technology-packed hiking sock. Durable enough to take on major miles, this full cushion three-quarter crew is the favorite of hikers and backpackers who prefer a lower height sock.