With the Zhik Men's Sailing Boot ZK 900 you have a 100% waterproof boot that provides excellent grip even in the harshest weather conditions. With reinforcements in the heel and midfoot to reduce the risk of injury in the ankle area and provide greater comfort. Thanks to the processing of neoprene and rubber, the sailing boot keeps feet comfortably warm and dry. Material: Outsole: 90% rubber, 10% EVA foam. Midsole: 80% neoprene, 20% nylon. Upper: 90% neoprene, 8% polyester, 2% EVA.