M Select DRY BARRIER impermeable membrane seals out water and lets moisture escape, Waterproof nylon ripstop upper Stratafuse exoskeleton provides a glove-like fit for lightweight support Metal hooks and eyelets for secure lacing, Bellows tongue keeps debris out Kinetic Fit BASE removable contoured insole for flexible support Air Cushion in the heel absorbs shock and adds stability, EVA foam midsole for stability and comfort. Merrell mountain-grade Quantum grip rubber outsole, Vegan-friendly, 5mm lug depth