"Perfectly well!"- Thats the answer to the question you just asked of "But how does it stay on?!"  It actually stays there perfectly fine hugging your junk comfortably, who knew?! Its made in black on black leather look snakeskin pattern spandex. Its GENIUS, if you ask us, and YOU will be the only thing anyone ever talks about for the next six months if you buy it! Promise!  It really only needs to be made in three sizes as there is no waistband. Available in three sizes Small 28" to 30" ( 70cm to 75cm), Medium 30" to 32" (75cm to 80cm), Large 32" to 34" (80cm to 85cm).  Like all Slick It Up products the Cobra is made in Manhattan with a portion of all sales benefitting charity.