An athletic shoe is a type of footwear designed for sports or other forms of physical exercise. Common types of athletic shoes include sneakers, tennis shoes, and cross trainers. Sneakers are lightweight shoes with a rubber sole and canvas or leather upper. Tennis shoes are designed specifically for playing tennis and have a thicker sole and more cushioning than sneakers. Cross trainers are a hybrid of sneakers and tennis shoes, designed for multiple activities such as running, walking, and aerobics.