Fox River Wool Work Heavyweight Cold Weather Mid-Calf Boot Socks 48% Acrylic/40% Wool/11% Nylon/1% Spandex Made in US TOASTY WARMTH ON THE CHILLIEST DAYS: Heavyweight winter socks are made of a wool/acrylic blend that is soft on the foot, but has the rugged durability of a mountain goat MADE TO LAST: Nylon-reinforced heel and toe areas add durability and longer sock life Bullet feature 3 (optional) : COMFORTABLE ENOUGH TO HIKE FOR MILES: Fully cushioned heavy wool construction absorbs shocks and insulates foot CUSTOM-FIT CONSTRUCTION: Memory-knit contruction to keep shape 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