Stainless Steel Vacuum Insulated Double Walled Bottle. This Vintage shape bottle is made with advanced technology to keep your drinks stay ice cold for 24 hours or piping hot for 12 hours due to our innovative double-wall vacuum insulation. For added insulation, bottles include a copper coating that provides a temperature shield. Double Wall: built to last, high quality stainless steel, vacuum insulation. No leak, no condensation. Great bottle for keep drinks cold in the summer, keeps drinks hot in the winter. Health & Safety: Measured 500ml, drink enough water each day. Perfect for ice water, ice coffee, hot drink, hot chocolate, ect. Must for office worker, students, baby, sports, outdoors. These are Safe food grade stainless steel is the best choice.