Farm to Feet Boulder No Fly Zone Lightweight Hiking Crew 40% merino Wool/40% Polyester/19% Nylon/1% Spandex Made in US Our fabric is treated with insect repellent that affects the insect's nervous system causing "hot foot", making it fly away before it may bite 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 Reinforcing yarns woven into the stretch shell increase durability, while wool fibers sit closer to the skin for maximum insulation Bottom-of-foot cushioning across the entire sole provides shock-absorption that reduces impact from running and hiking and Fitted instep reduces Bulk Full-density cushioning provides better insulation, wicking, impact protection and faster moisture absorption to keep you Dry and reduce friction