Injinji's five-toe patented designed specifically for runners and hikers Prevents blisters & hotspots while running 33% Coolmax (polyester), 65% nylon, 2% Lycra (spandex) 344130 Ideal use for running, walking and athletic activities Superior mositure management during runs of all lengths Natural Toe Splay The Liner + Runner is a unique, two-sock system designed to provide ample blister protection, moisture management and total foot utilization while increasing cushion on the sole. The ultra-thin Liner is the front line of protection against blisters with its five-toe toesock design. The Runner is worn over the Liner to increase comfort and cushion with a terry midweight knit throughout the bottom of the foot. Meanwhile, the mini-crew height provides a secure barrier around the ankle to prevent dirt, sand and other elements from getting into the sock enabling more running with less distractions. The Liner + Runner is only sold as a two-sock set.