YUFENG Stainless Steel Vacuum Insulated Coffee Mug Travel Drink Bottle (GOLDEN) Durable stainless steel construction keep liquids hot or cold Keep hot: After 10 hours no less than 45 degrees celsius Keep cold: After 6 hours no less than 10 degrees celsius Vacuum Insulation Technology: Where air is sucked out, creating a vacuum between the wall to minimized the effect of outside temperature Drink lid opens with push button ease and locks closed for carefree travel