While double-wall vacuum insulated, this bottle is designed for use with both hot and cold beverages and is recommended to be washed by hand and disassembled and cleaned prior to first use. This double-layer insulated mug can be printed with your pattern or when any other things you want to print, double-layer stainless steel design, so that it can allow us to keep the water temperature cool in the hot summer, and keep the water at a certain temperature in the cold winter, you can choose multiple colors.