Sandal or clog is a type of SHOE. It is an open-toed footwear with a sole and straps that go around the foot or ankle. Sandals or clogs can be made from a variety of materials, including leather, rubber, and plastic. They are often used for casual wear, but can also be used for more formal occasions. Sandals or clogs are popular in warm climates, as they allow air to circulate around the feet and keep them cool.