Anatomical cushioned trail running sock. Resilient Isolfil cushioning wick away moisture and provides shock absorption. Flat seamless toe construction to help prevent blisters. Arch grip section for optimum fit. Asymetrical left and right socks with terry loop cushioning and Plus new terry loop ankle fenders. 74% Polypropylene (Isolfil) 18% Nylon and 8% Elastane.