The best running shorts are made with a performance moisture-wicking fabric, such as polyester or nylon, have a built-in liner for support, and offer a secure place to store items like your phone, keys, or fuel. Some running shorts are blended with a stretchy fabric such as spandex or elastane to allow for unrestricted mobility when running.
Running shorts come in all different lengths from 2 to 7 inches, but 5 inches seems to be the most popular length.