Contigo AUTOSEAL Aria Vacuum Insulated Stainless Steel Travel Mug, 16oz, Stainless Steel with Blue Vacuum insulation keeps beverages hot for 5 hours or cold for 14 hours Patented autoseal technology for 100 percent leak-proof and 100 percent spill-proof performance Button toggles to lock, preventing accidental actuation when carrying inside bags or with other items Double-wall stainless steel construction eliminates external condensation 100-percent fda-approved, bpa-free materials; top-rack dishwasher safe Lifetime Warranty