Come and see our amazing products. Vacuum insulation:The insulated water bottle has a double-wall exterior with a vacuum seal between the walls. Your drink can hold temperature well. The exterior of the vacuum sealed area is coated with copper for additional insulation. Copper reduce the transfer of heat, adding even more insulation to your water bottle.Your drink will truly stay as hot or cold as long as possible. Even filled with ice or boiling water,the surface of metal water bottle will never sweat or get hot to the touch! Pls confirm with us about the packing info, stock color and exact production time before placing your order.