Injinji's five-toe patented designed specifically for runners Five-toe sleeve design prevents blisters and and promotes natural toe splay Ideal use for running marathons and ultras races Superior moisture management during long training days Natural Toe Splay Say goodbye to blisters with Injinji Run Lightweight toesocks. The Run series offers innovative, restriction-free movement and eliminates skin on skin friction, which is one of the primary causes of blisters. The five-toe sleeve design and superior fiber construction keep feet dry and protected while running on any surface, at any distance. From training runs to race day, Injinji running socks will go the distance by keeping your feet protected in any shoe. The no-show length rests below the ankle and features a heel tab to protect against chafing and keep the sock from sliding into the shoe.