Milspec Mid-Calf Military Boot Sock is a comfortable and breathable military sock made with 92% acrylic, 7% nylon, 1% spandex material. This mid-calf sock has reinforced toes and heels for extra strength and durability while you are camping, hunting, or performing other outdoor activities. These military socks feature flat toes, ribbed tops, and cushioned shin and footbed for extra support.