Injinji's five-toe patented designed specifically for runners and hikers Prevents blisters & hotspots while running 75% Coolmax (polyester), 21% Nylon, 4% Lycra (spandex) Hand Wash Only Ideal use for running, walking and athletic activities Superior moisture management during runs of all lengths Natural toe splay An exceptional, lightweight liner that’s been proven on the longest trails – use it as your sock system’s baselayer, or on its own if you want to ride light. COOLMAX and nylon fibers are combined for exceptional moisture management, breathability, durability and softness. The patented five-toe design minimizes skin-on-skin friction that leads to blisters and lets your foot work naturally for better alignment and feel underfoot. Designed as a liner, this ultrathin crew also works well on its own for warm weather hikes and runs.