The all new CellBlock13 Smuggler Jock takes jockstraps to a new level with an attached fanny pack for hiding your valuables. This jock is made of neoprene (rubber) including the attached side pack. The side pack contains a small and large compartment with velcro flaps to secure your items. An additional pocket with a zipper provides extra storage for your valuables. The large compartment measures 3.5" by 5.75" and is large enough to fit some cell phones.