Contigo Autoseal Randolph Stainless Steel Travel Mug with Button Lock, 16-Ounce, Berry Patented AUTOSEAL lid is 100% leak-proof and spill-resistant Patented autoseal lid protects against leaks and spills by automatically sealing between sips Double-wall vacuum-insulated stainless steel keeps beverages hot for 4 hours or cold for 12 hours AUTOSEAL button slides to lock, preventing accidental opening of the mug when not in use Travel mug lid pivots open for easy cleaning and is top-rack dishwasher safe Patented autoseal lid is 100-percent leak-proof and spill-resistant Patented autoseal lid protects against leaks and spills by automatically sealing between sips Double-wall vacuum-insulated stainless steel keeps beverages hot for 4 hours or cold for 12 hours Autoseal button slides to lock, preventing accidental opening of the mug when not in use Travel mug lid pivots open for easy cleaning and is top-rack dishwasher safe