NOT INCLUDED BATTERY PACK Its polyester construction and quick drying properties ensures easy maintenance, while the adjustable fit accommodates layered outfits for comfort across season Stay comfortably insulated during brisks morning walks, or long hours in unheated workspaces, adapting seamlessly from rainy autumn days to frosty winter evenings warmth with this heated vest featuring temperature control technology, designed to combat chilly weather while maintaining breathability, perfect for outdoor adventures, winter commutes, or extended time in cold environments Craft from lightweight, practical polyester with a detachable hooded and multiple functional pockets, this vest combines practicality for adaptable layering in changing conditions