Teko touts these socks as "...best socks for the planet" and they back it up by using all natural and recycled materials. Holistically, sustainably farmed Tasmanian merino wool naturally wicks moisture to keep feet dry and comfortable on trail regardless of temperature. Ecopoly 100% recycled polyester is soft, has great moisture transfer, and adds incredible durability to the toe, Y-heel and back of foot. Nylon covered Lycra spandex supports arches and decreases bunching thus prevents blisters. Dense terry on bottom, heel and toes provides ultimate comfort and cushioning while non terry top provides improved breathability. Lin Toe flat toe seams are non-chafing to provide maximum comfort. Launders easily in washing machine. Environmentally conscious Teko buys 100% American wind energy credits for their offices and manufacturing. Save 10% on socks! Buy any 3 pairs of regular-price socks and save 10% on each pair when you check out.