The Avex 20 oz. AutoSeal Stainless Steel Travel Mug is a vacuum insulated stainless steel tumbler that was built with ruggedness in mind. A durable lid features a drop-down mechanism for easy cleaning and is dishwasher safe. Vacuum insulation keeps beverages hot for up to 8 hours and cold for up to 24 hours. AutoSeal button operated lid automatically seals between sips to eliminate spills and leaks. Slide lock prevents the AutoSeal button from accidentally being pushed while on-the-go. Drop Down mechanism underneath the lid for easy cleaningReservoir drinking interface for an improved drinking experience. Protective drinking spout cover to keep out dirt and germsExclusive, patent-pending, dishwasher safe base design grips table tops and reduces clanking. Sleek design fits most cup holders. Top rack dishwasher safe. 100% BPA free