☕【Stainless Steel Material】 Coffee tumbler is made of food-grade stainless steel. The inner part is electropolished, durable, antirust, and has no metal smell, insulated coffee mug is harmless to human health. ☕【Double-wall Vacuum Insulation】 The double-wall vacuum insulated design can prevent heat from transferring to the outer wall of the water tumbler and ensure that your drink stays cold or hot. It retains heat up to 3 hours and stays cold for up to 6 hours. ☕【Leak Proof】 The insulated tumbler is equipped with a flip cover to ensure a tight fit, easy to close, and prevent leakage and splash. There is a drinking hole on the thermal coffee mug top, which can be used for straw or direct drinking. Large opening for easy cleaning and quick filling. ☕【Anti-sweat Design】 Stainless steel tumblers are powder-coated, durable, and easy to grasp. The anti-sweat design keeps your fingers dry, stainless steel cups prevents sweating and condensation, ensures no stains or burns. ☕【Multi-scene Use】 Our insulated cup is simple and fashionable in design and easy to use. Insulated coffee mug is very suitable for daily use, whether it is a party, backyard barbecue, swimming pool or beach, self-driving travel, or office environment, is the best choice.