Fox River Mills® Men's Heavy Work Thermal Sock - 2/pk features a premium blend of wool and acrylic to keep feet warm and wick moisture away from skin. Lycra® 3D® knit throughout for a memory fit Fully thermalined for shock absorption and insulation Fully reinforced for extended wear Smooth, flat toe seamHeavyweightMid-calf heightMade in the USASize Chart:S - fits Men's shoe sizes 3 - 5.5M - fits Men's shoe sizes 6-8.5L - fits Men's shoe sizes 9-11.5XL - fits Men's shoe sizes 12-14.5 Product Features: Fabric:48% acrylic, 40% wool, 11% nylon, 1% Lycra® spandex Fox River Mills Men's Heavy Work Thermal Sock - 2/pk