Dickies Men's 4 Pack High Bulk Acrylic Thermal Boot Crew Socks 84% Acrylic, 13% Nylon, 3% Spandex Imported Machine Wash Moisture control fibers keep feet dry and warm High bulk acrylic fibers provide heavy cushion throughout foot and leg for added comfort Boot length provides superior warmth Reciprocated heel and toe for superior fit and comfort Reinforced heel and toe provides added durability and full cushion comfort