Waterproof membrane seals water and lets moisture escape Pig leather and mesh upper 100% recycled laces and strap Gusseted tongue keeps debris out 100% recycled mesh lining Kinetic Fit Advanced removable contoured footbed with reinforced arch padding Merrell Air Cushion molded nylon footbed in the shock absorbing heel and adds cushioning Stability Lightweight EVA foam midsole for stability and stability and stability.