Upper: Ultra-soft, water resistant, kangaroo leather upper. Anti-stretch and anti-slip micro-fiber lining. Slip lasted construction made from nylon and Engage materials. Insole: Anatomic, removable insole in cotton and shock absorbing EVA foam. Lasting Board: Ergos Sliplast is the anatomic footbed that is composed of two layers of material. The shockproof Engage material on the surface that contacts the foot is soft and comfortable. The Pebax material on the underside provides needed rigidity for stability. Outsole: MG 14 outsole with Axeler technology, which is a threadlike Tech Alloy frame inserted directly into the triple density polyurethane sole, improving forefoot flexibility and ensuring maximum stability. The 14 fixed studs provide excellent stability and improved abrasion resistance.