There's a commuter, traveler, and urban explorer in everyone. The Contigo AUTOSEAL? The ultimate in on-the-go convenience, this thermal coffee mug is leak- and spill-proof thanks to AUTOSEAL? technology. Press a button to drink, then release to seal after every sip. THERMALOCK vacuum insulation keeps liquids piping hot up to 8 hours or icy cold up to 16. The Easy-Clean Lid pops open completely when youre done drinking, letting you get into all the nooks and crannies for thorough cleaning. The innovative lid is also one piece, so there are no parts to misplace when you toss it on the top rack of your dishwasher. Stainless steel bodies are hand-wash only.