Nike uses European sizing, which is in whole numbers like 8 or 9. Adidas shoe sizes are usually in half numbers, such as 7 1/2 and 8 1/2. Nike shoes typically have a cushioned rubber sole with molded teeth on the toe and heel for grip while running. Adidas soles are made of natural gum rubber that’s thicker than regular gym shoes but not quite as thick as wetsuit neoprene soles.