61% Merino Wool/34% Nylon/5% Spandex Made in US 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. 1/4 Crew Height: Just above the ankle. 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.