Our Running sock is our Original sock and all other styles are variations off this core product. The Running sock is a flat knit (no cushion) midweight sock designed for all running activities. Features the perfect combination of moisture management and friction-free control. This sock provides all the protection you need without shoe sizing issues. Content: Inner Layer 70% Dri-Wright Polyester, 30% Nylon - Outer Layer 68% Dri-Wright Polyester, 28% Nylon, 4% Lycra |