Primus C&H Thermal Vacuum Flasks are manufactured from double-walled 18/8 stainless steel. The exterior of the flasks are powder coated to provide extra grip even when wearing thick gloves. Two stoppers are provided with each flask, a quick stopper which lets you pour the contents without unscrewing the stopper, as well as an extra stopper for winter use & extra long heat retention. Liquid filled at 95