These are the shorts you need for your next rave, dance, club event, or party! They're made with 92% Nylon and 8% Spandex which means a flexible, breathable, and awesome fit. They come with a standard battery pack that can easily be hidden inside of the pocket. The battery pack takes two AAA Batteries, and lasts alllllll night! Remove the battery pack and hand wash, Hang to dry.