This Sneaker features a VIBRAM Megagrip made for gravel and grass, sand and sun, roots and rocks. VIBRAM Litebase outsole is thinner by about 50%, and lighter by up to 30%. 5mm lugs. Long rubber compound. Durable upper, made of a unique blend of monofilament polyester and TPE. EVA midsole, lighter weight, supreme cushioning, and step-enhancing rebound, with a 31/23mm stack height and 8mm drop. Sole - 100% rubber. Upper - 50% TPE, 22% polyester, 28% nylon. Monofilament.