Synthetic Made in USA Synthetic sole Shaft measures approximately 0.8\" from arch Platform measures approximately 0.5 Toe box ventilation ports add breathability and help water and debris drain away. Water-friendly and buoyant. Fully-molded Croslite?,? construction for lightweight cushioning, durability, and a conforming fit. Croslite?,? heel strap for a secure fit. Odor-resistant, easy to clean, and quick to dry. Lightweight, non-marking Croslite?,? outsole. Roomy fit with generous length and width.