Waterproof membrane seals out water and lets moisture escape Knit upper 100% recycled laces and webbing Bellows tongue keeps out debris 100% recycled mesh lining 100% recycled mesh lined removable EVA insole Molded nylon arch shank Merrell Air Cushion in the heel absorbs shock and adds stability Rock plate for protection 10% recycled EVA foam midsole Merrell mountain-grade Quantum Grip rubber outsole Block Heel Lace-Up closure Rubber sole material Bravada 2 Waterproof Waterproof