TOP GRADE TPU Button closure Hand Wash Only Food grade TPU instead of cheap EVA or PVC Eco - friendly TPU material has good performance in elasticity , anti-aging. Non-toxic, No Smell and Harmless. Quick-drying, reusable, durable, tear resistant, waterproof and breathable. Foldable in small size, much more portable and lightweight, keep it in the backpack/ house/ office or car for emergency. Stylish design to make you more eye-catching in rainy days.