Engineered with precision, the Cello Puro Steel-X Marathon features an inner steel bottle construction complemented by advanced PU insulation technology. This cold insulated bottle maintains optimal beverage temperature for extended periods, making it ideal for diverse environments. Whether for professional settings, educational institutions, fitness regimens, outdoor excursions, or home use, this versatile bottle delivers consistent performance. The specialized design ensures compatibility with refrigeration while maintaining structural integrity and insulation properties.