57% US NYLON, 42% US MERINO WOOL, 1% US LYCRA SPANDEX U.S. Merino wool is soft and cool in the summer and warm in winter. We source our 100% U.S. grown merino wool exclusively from sheep raised by American farmers on American farms. A slightly shortened crew that fits just below the calf but above a hiking boot. Reinforced construction and low-stress seam placement reduce wear and tear, increasing the life of the sock. Advanced knitting techniques create a totally seamless toe closure in the toe box, reducing bulk and eliminating blister-generating friction. U.S. Merino wool is soft, cool in the summer, and warm in winter. Farm to Feet sources 100% US-grown merino wool exclusively from sheep raised by American farmers on American farms. A slightly shortened crew that fits just below the calf but above a hiking boot. Reinforced construction and low-stress seam placement reduce wear and tear, increasing the life of the sock. Advanced knitting techniques create a seamless toe closure in the toe box, reducing bulk and eliminating blister-generating friction.