Patented AUTOSEAL® lid is 100% leak-proof and 100% spill-proof. * Drinking made easy! Press to sip. Release to seal. AUTOSEAL® automatically seals between sips to ensure no spills. * Vacuum-insulated technology keeps beverages hot for 4 hours, and cold for 12 hours. * Contoured body makes this mug easy to hold and easy on the eyes. * Will hold up to 16 oz. of your favorite beverage and fits most standard car cupholders.