Puffer Bag With Strap - White100% Polyuretan: Key material for durability and shape retention. In shoe soles, it serves as a firm foam that doesn't compress and provides long lasting cushioning. In clothing, it forms the basis of elastic fibers that ensure the garment fits perfectly and doesn't stretch out. PU is also a material for high quality synthetic leathers, which are strong and easy to maintain. Its versatility gives shoes, clothing, and accessories the necessary strength