OLUKAI Women's 20294-4848 - Hoopio Synthetic UPPER: Water-resistant man-made material in Dark Java. WATER RESISTANT: Lightweight quick drying breathable and durable materials built for in and around water. OUTBOARD STRAP: Built into the outside surface of the sidewall instead of the footbed our unique Outboard Strap Construction offers a free yet secure fit for the most comfortable arch support possible. FOOTBED: Anatomically molded micro-textured PU midsole. Water-ready build. VEGAN FRIENDLY: the durability traction and support you expect from OluKai while using 100% high-quality synthetic materials 0% animal products.