The travel tumbler is with double walled vacuum insulation technology, keeping your favorite beverages hot for 3+ hours and cold for 9+ hours. Sweatproof, no condensation. With premium 304 food Grade stainless steel inside, lead free, easy wash and unbreakable. The eco-friendly lid is completely BPA free; silica gasket seals to achieve maximum spill proof capability. Wide mouth drinking hole on the top, straw friendly, with splash proof sliding cover.