FoxRiver Outdoor Polar Crew Heavyweight Thermal Socks 67% Acrylic, 17% Wool, 14% Nylon, 2% Spandex Made in US TOASTY WARMTH ON THE COLDEST DAYS: Highest level of cushioning for extended trips and frigid weather BENEFIT FROM NATURE'S FINEST INSULATOR: Wool offers great features including thermoregulation to help balance temperature and keep you dry by absorbing as much as 30% of its weight before it feels damp; plus, it's breathable and naturally resists odor MEMORY-KNIT CONSTRUCTION: Spandex knit throughout the sock gives it a memory-fit helping it keep its shape wash after wash, wear after wear MADE TO LAST A LIFETIME: Heel and toe are reinforced with nylon to add durability and longer sock life BACKED BY COMPANY STANDARDS OF EXCELLENCE: Fox River products are guaranteed against manufacturing defects for one year; products may be returned within one year with the dated receipt to the store where you purchased them or by following our FoxSox.com return process