Carhartt WA066 Womens Extremes All-Season Boot Sock. 69% acrylic, 18% wool, 12% nylon and 1% lycra-spandex. Midcalf length, heavyweight sock. Fully cushioned foot and lower leg for comfort. Reinforced heel and toe. Non-terry vamp and mesh vents reduce bulk and allow breathability. Fabric blend regulates temperature and keeps feet dry. "No feel" toe seams for comfort. 20 denier spandex for ultimate fit properties. Anti-odor fabric treatment provides freshness protection. Medium fits shoe sizes 6-8.5 Large fits shoe sizes 9-12