These Year Round OTC Socks from 5.11 Tactical are USA-made over-the-calf socks with the features to stand up to whatever your day brings. TransDry copper thread cotton fabric with built-in arch support. Comfort mesh calf support. Ventilation channels. Reinforced heel, sole, and toe. Copper anti-microbial mesh. Moisture wicking design keeps feet cool. VPN: 10013.