Cello's holly bottle is made of thermo seal technology. With this stainless steel water bottle from the house of Cello, you can carry chilled water or your favorite beverage conveniently. Its superior insulation performance-patented vacuum technology and food grade material keeps beverages hot/cold/fresh for hours. Insulated double walled vacuum bottle is designed for maximum temperature retention that keeps your favorite hot drinks without altering their temperatures for a prolonged period of time. You can avoid re-heating boiled water hence saves gas, effort and time.