When running in late fall and winter conditions, the Injinji Snow Over the Calf sock is the perfect companion for staying warm, dry and blister-free. THERMOLITEA(R) EcoMade fibers offer performance benefits, including helping to generate heat using the body&';s infrared energy and utilizing hollow fibers to create an insulating layer of warm air within the sock. The anatomical fit prevents blister-causing friction, and the Over The Calf height protects the lower leg from the outdoor elements while staying secure. Targeted cushion underfoot and beneath each toe offers a plush feel and softens the impact of repeated footfalls. Ready to take on winter training? Lace up and get out there! Infrared Heat Generation THERMOLITEA(R) FAR INFRARED technology uses the body&';s infrared energy to help generate and maintain heat. Lightweight Insulation Hollow fibers create an insulating layer of warm air within the socks to keep feet and legs warmer than traditional socks. Moisture Management Each toe is wrapped in sweat-wicking material so your foot will be drier and therefore more comfortable than in traditional socks. Protective Cushion Extra cushioning on the footbed to increase foot comfort. Padded Toes Extra midweight terry throughout the toes. Arch Support Supportive band that offers a secure and stable fit. Blister Prevention With each toe protected, skin-on-skin friction is completely eliminated protecting your foot from blisters & just as important, hotspots. Total Foot Utilization When your toes are separated, properly aligned, and splayed it distributes your weight evenly which allows your entire foot to be engaged in any athletic activity. Fiber Content Fiber content: 63% Nylon, 34% THERMOLITEA(R) EcoMade, 3% LycraA(R);