Men's Lifestyle Socks: Made with acrylic fabric material for durability, welt-legged wool calf socks w iconic columbia logo Extreme Warmth and Lightweight: Provides light weight insulation for cold weather and for moisture management running sock Innovation in Sock Fabric Tech: Thermolite ECO - Technology in the yarn keeps wearer dry and warm longer 2-pair, fits sizes 13-15 Men's Targeted cushion support for comfort