The Flexboard shorts have been tested like no other shorts we have done. We wanted to create a pair of shorts that you can use as fight shorts or in the gym. After all the tests, we now make them in a lightweight strong polyester, flexible polyamide fabric in crotch, inside legs and also flexible in the back, just below waist. High slits in the side seam, three needle, extra strong stitching. Velcro and drawstring in waist. MMA: Slits in the side seam, elastic fabric in the crotch and in the back. Inside pocket for your mouth guard.Perfect for crazy submissions or those "lights out" high kicks. Works as well in the fight gym as in the weight room.GYM: The extra flexibility is perfect even for heavy leg days. Not to mention, people will think twice before cutting you of at the weight rack.