Arctic-rated to keep your feet warm in the coldest of conditions. Boot sock contains 88% worsted wool, 10% stretch nylon, 1% hi-bulk acrylic, 1% Lycra® spandex. Lycra-reinforced top. Full cushioned toe and flat toe seam prevents irritation and blisters. Non-terry vamp to reduce bulk; nylon-reinforced reciprocated heel and toe. Natural/gray/brown color. X-Large.