Not sure if these are supposed to be workout shorts - or swim trunks. They have an underwear (brief style) liner inside. I don't wear underwear normally and these come with them sewn into the shorts. They look like swim trunks due to this fact. But they are already see through where the underwear is not (I got them in white). These will be my workout at home shorts - or something at home...don't see wearing the all white ones to the gym...especially after sweating.