Extremely high-quality vacuum flask. The high-quality vacuum insulation technology by Thermax® ensures maximum preservation of cold or hot temperatures and maintains the contents on temperature up to 3 times longer than comparable thermos flasks! Special lightweight stainless steel, copper plated for optimum insulation and also 20% lighter. The special construction renders it virtually unbreakable and dent resistant! So the insulation hardly diminishes, even after intensive use. In other vacuum flasks, a dent causes an immediate reduction of the insulation. With a cap that doubles as a drinking cup with a practical push-button underneath. Comes with a 50 year guarantee!