"With multiple options of men's athletic shorts on the market, the lining, length, and material needs differ depending on the activity, personal style, and fit preference," says Joe Kudla, founder of Vuori.
Material: Folks, leave cotton out of this one and go for synthetic fabric that actually can handle the sweat and the stretch. Because gym shorts are designed for you to move in and perspire in, a blend of polyester (which is moisture-wicking and quick-drying) and spandex or elastane (both offer a four-way stretch) is often a sure bet. On the other hand, a nylon stretch blend is also popular because nylon is breathable, unlike polyester, for combatting the summer heat.
Liner: "Unlined shorts offer more versatility for layering, while lined shorts provide additional support and comfort for high-impact activities," says Michael Hamlin, NSCA, CSCS. I.e., the higher intensity your exercise demands, the more likely you'll need a pair of gym shorts with liner since, besides support, the liner also directly wicks away sweat. Otherwise, you can opt for unlined shots since they let you move easily, and are thus great for moderate workouts.
Inseam: Inseam measures the length on the inside of the leg, from the bottom up to the groin or crutch area, and personal trainer Dimitrios Kokkinellis recommends considering the right length and coverage for your workouts. "Shorter inseams (5-7 inches) allow for greater mobility, while longer inseams (9-11inches) provide extra coverage and support," he says.
Pockets: "I also say pockets are a must for me and extra bonus if they zip. Not a pocket in the back of my waist that I can barely reach but pockets on the front sides," says Andy Stern from Rumble Boxing.
All in all, a pair of ideal, versatile gym shorts is described by Bear Handlon, former CrossFit Games athlete and founder of activewear brand Born Primitive, as one with "built-in compression liners, an elastic waistband with drawstring, overall elasticity to allow mobility, lightweight material that’s quick-drying, and convenient pockets throughout for your cell phone and keys.”