The Boot Liner Crew by Carhartt is a 14 inch tall boot liner made of 100% acrylic fabric. It features a crew neck, rib knit cuffs, and a tagless label for comfort. This boot liner is designed to provide lightweight warmth and wick away moisture. It comes in sizes S-3XL and is machine washable. The Carhartt brand focuses on quality, durability, and comfort in their clothing. This acrylic boot liner delivers warmth without bulk.