A lot of runners prefer a shoe with a mesh design in that the built-in ventilation minimizes any risk of blisters, athlete's foot, or any odor-causing bacteria or infections. If a shoe features a deep tread, that's a good indication that the shoe is custom-made for running on loose terrain and if features a narrow tread, that's a good indication that the shoe is custom-made specially for joggers running on the street, or on a rubberized track.