Injinji"s Performance No Show Liner is to be worn as a first layer sock to interface with your favorite traditional outer sock or to be worn alone with minimalist footwear for those that prefer ultra-sleek and lightweight design. Built with 5 separate toe sleeves, the Injinji Performance Liner fits your foot like a glove. This unique design is constructed with CoolMax, Lycra, and Nylon to provide a custom fit that protects from blisters while keeping your feet comfortable, cool, and dry.CoolMax• This enhanced polyester fiber provides superior moisture management and comfort. The wicking capabilities of CoolMax are ideal even in extreme conditions caused from any sport or activity.Lycra• This synthetic fiber is strong, lightweight, flexible, comfortable, machine washable, and shape retentive. It can stretch over five times its relaxed length with memory for recovery for the perfect fit.Anatomical 5 toe design• Keeps toes dry, prevents blisters as well as properly aligns toes for natural movementArch Support• Mid foot stability that eliminates bunchingVector heel• Precision stitching for custom fit and to prevent slippingDual welt band• Helps maintain sock in place