FuelCell midsole foam with approximately 3% bio-based content delivers a propulsive feel to help drive you forward. Bio-based content is made from renewable resources to help reduce our carbon footprint. Synthetic suede and mesh upper WATER PROOF is built for super seam-sealed waterproof protection to help you battle the storm Rock Stop Plate outsole disperses pressure and helps protect the bottom of feet on rocky, uneven terrain Hydrohesion rubber outsole helps you maintain grip in wet conditions