Convert any outdoor outfit into a heated garment with the universal heating layer. Designed to be ultra thin yet extremely warm, it lays effortlessly on your back for all-day wear. The adjustable shoulder straps and waistband make the fit adjustable and suitable to fit over or under any garment. The multi-zone controller on the waistband also allows you to adapt to changing conditions by increasing or decreasing the heat levels. Simply plug the USB adapter into any 5V power bank (sold separately) and enjoy all-day heat.