a.flannelette fabric, soft and smooth hand feeling;b.short charging, long time warming;c.Qute shape; d.compertitive price. Electric hot water bag Flannelette Electric warm water bag 1)Quickly warm --5minites charge, 2-5hours warm keeping ;2)Comfortable hand feel; 3)Explosing proof and automatically swith off; 4) Fabric optionable;5)Rechargeable, no need to refill water Welcome to your inquiry.