If you're shopping for new athletic shoes, be sure to try on both shoes and wiggle your toes. If you don't have at least a half an inch (1.3 centimeters) between your longest toe and the end of the shoe, go up a size. If you can detect the outline of your toes in the top or on the side of the shoe, try a larger size or wider shoe. Finally, be sure the shoe is wide enough. The side-to-side fit of the shoe should be snug, not tight.