This Cold Weather Sock from 5.11 Tactical is USA-made with a Merino wool blend for warmth in cold conditions. The sock features extra yarn knitted into the leg for added warmth as well as a tab top cuff for easy wear. Terry loop leg. Arch and ankle support. Ventilation channels. Reinforced heel, sole, and toe. Blister protection in heel and toe. Anti-microbial and moisture-wicking finish. VPN: 10011.