The Boot Liner Crew by Carhartt is an 8" tall boot liner made of 100% acrylic fabric that provides lightweight warmth and wicks moisture. It features a crew neck, rib-knit cuffs, and flatlock seams to prevent chafing. This boot liner is machine washable and made in the USA. It comes in sizes S-3XL in black, brown, and navy heather colors. This is a useful liner to wear under boots or other footwear to keep feet warm and dry in cold weather conditions.