KUUK Travel Cup thermos Mug for Coffee & Tea - Stainless Steel - 12oz (Grey) Keep drinks hot when youre on-the-go! With double-walled vacuum insulation technology, your portable mug is guaranteed to keep coffee, tea and other hot beverages warm for hours. Wide mouth with leak-proof lid for easy access and drinking - also makes your thermal tumbler quick and easy to clean. Made with high quality, 304 food-grade stainless steel and copper, ensuring durability and the best possible heat preservation. Keeps coffee hot for 6 hours. Flip top lid for quick access and closing Comes with Kuuk 5 year warranty