Lifesky 500 ml Stainless Steel Vacuum Insulated Thermos Cup Travel Mug (Champagne) Modern Stainless Steel construction with smooth glossy finish.^Vacuum Insulation Technology where air is sucked out creating a vacuum between the wall to minimized the effect of outside temperature.^Keep liquids HOT or COLD up to 12 hours. Leak proof design lid with easy twist and pour operation for quick liquids access.^Built in cup with convenient handle.^Lid and cup is made out of BPA free plastic -- can be taking apart for easy cleaning.