Both the inner sole and outsole are made of polyurethane, providing comfort and cushioning. The inner sole is removable so it can be rinsed and cleaned. The sole also enables the S100 Aquashoes Tribord to float so they are easier to find if they fall off during a game or are swept away by a rising tide. There is a large hook at the back, making them easy to pull on and hang out to dry. The upper covers the toes and the back of the foot, the zones most at risk. The outsole is pimpled to help you grip when walking on rocks. Water runs off very quickly thanks to meticulously placed channels and holes.