A high performance un-heated insulated jacket made from a highly durable flame retardant polyester fabric and insulated with a thermally efficient, flexible E-glass fibre blanket, fitted with Velcro straps and a moveable flap for ease of access. The HIJD un-heated jacket provides a cost effective method of minimising heat loss from pre-heated containers and their contents. When used in conjunction with the base drum heater (HBD) heating times and energy costs are reduced. This product is suitable for a 200ltr drum.