Farm to Feet Men's Rock Springs Lightweight Crew Socks 73% U.S. Merino Wool 26% U.S. Nylon 1% U.S. Spandex Made in US Reinforced construction and low-stress seam placement reduce wear and tear, increasing the life of the sock Merino wool is soft, itch-free, naturally odor- and bacteria-resistant, cool in the summer and warm in winter. Our merino wool is 100% U.S. Grown Advanced knitting techniques create a totally flat connection in the toe box, reducing bulk and eliminating blister-generating friction Circumferential compression from the top of the sock through the arch creates a comfortable fit that helps support the foot throughout the day To ensure long-lasting comfort and fit, farm to feet socks should be machine washed cold and laid flat to dry