Get both feet measured: Your foot size changes over time, so it's important to get your feet measured when trying on new running shoes. Try on shoes at the end of the day: Your feet swell throughout the day and will be largest at the end of the day. This helps you avoid buying shoes that are too small.

It depends on the type of running you're doing. For example, adidas has lightweight running shoes that keep up with your need for speed and are the go-to choice for intervals and speed training.

If a man tries to squeeze into a women's running shoe that has a more narrow fit, it may result in rubbing and blisters. You can also get blisters from wearing a women's shoe that is not designed for your level of pronation. A similar thing may happen if a woman tries to wear men's shoes.