This "Sardines" rain boots are different from ordinary rain boots for daily use. They can be easily rolled up and the volume is only one-fifth of the original size. It is made of a recyclable material called thermoplastic polyurethane (TOU), which is very soft. The three-fold structure after rolling up makes it very easy to carry. You usually put it in the trunk or handbag of your car when you go to work. Once it rains, you don't have to worry about getting your shoes and trousers wet.