The ExoGlo 3 bodywarmer uses the finest Primaloft insulation which combined with 3 FabRoc? heating panels - one large kidney panel and two chest panels creates a cocoon of heat (includes drawcord). The ExoGlo 3 offers 2 - 5 hours of heating time depending on heating levels selected. The outer Flylite fabric is shower proof, windproof and breathable. It is designed to be very lightweight and is ideal for a wide range of outdoor activities.Power Packs Supplied Seperately, Unless Specified.