Vacuum insulation keeps beverages hot for 5 hours or cold for 14 hours. * Patented AUTOSEAL® technology for 100% leak-proof and 100% spill-proof performance. * One-handed operation for convenient drinking during activities - just press the button to sip; release the button to automatically seal the mug. Button toggles to lock, preventing accidental actuation when carrying inside bags or with other items. * Large 14 oz. capacity perfect for long commutes. * Sleek design fits car cup holders.