Black MMA 4-Way Flex Piranha Gear Board Shorts w/ Logo polyester With a longer thigh length, Flex-Panel in legs and groin, and split side seams for freedom of movement, we originally intended these for people that practice MMA or UFC mixed martial arts... ...but they work just as well for Karate, Boxing, Muay Thai, Kickboxing, and general grappling. We see lots of use for Crossfit training too, but do keep in mind these are made for optimal flexibility and freedom of movement - so they are looser than a swim suit might be! Polyester / nylon blend (80/20) with a longer thigh length, Flex-Panel in legs and groin, and split side seams for freedom of movement.