Foam sole Upper: Ultra lightweight, soft, ultra flexible, durable EVA material Fabric Lining: Soft and breathable fabric lining for increased all day comfort Soles: Waterproof EVA material, non-slip, flexible, durable, ultra lightweight Hook-and-Loop Closures: Dual adjustment straps designed for quick adjustability, more secure fit throughout the day, and easy on-and-off. Water Friendly: waterproof, ultra-soft and thickened EVA foam provides your child daily comfort for any occasion!