THE PARTY PANTS ARE A STANDARD FIT. WE RECOMMEND THE SAME SIZE AS YOUR SHORTS. OR IF YOU LIKE THEM QUTITE TIGHT YOU CAN GO DOWN A SIZE.QUICK DRY POLYESTER FABRIC WITH A MENS-SPECIFIC COOLMAX CHAMOIS AND MEDUM DENSITY FOAM.THESE COME WITH ITALIAN SILICONE GRIPPERS WHICH ARE EASY ON THE SKIN BUT STAY IN PLACE.