CloudLine Merino Wool 1/4 Top Running & Athletic Socks - Ultra Light- Made in US 36% nylon The softest wool running socks on the market. Ultra Light weight premium merino wool quarter top running socks with reinforced cushion zones for durability and comfort 59% Ultra soft merino wool, 36% Nylon, 5% Spandex. Made with ultra-fine 22.5 micron merino wool. Designed for long-lasting softness and machine washable Quick wicking to keep feet dry and blister-free; anti-microbial to keep feet fresh; vibrant colors to keep you looking good Lifetime Guarantee. Machine Washable. Manufactured in the USA with merino wool and cushioned with your free spirit in mind. Great for running, trail running, hiking, biking, mountain biking, trekking, or walking. WHY MERINO? Merino wool comes from a species of sheep that produces very fine and soft wool. It is not coarse and itchy like other wool socks, but amazingly soft, while still retaining all of the wool's other wonderful properties. Your new favorite socks. Buy some today.