Vacuum insulation keeps beverages hot for up to 5 hours or cold for up to14 hours.. * Convenient lock button toggles to lock, preventing accidental spills while transporting. * Patented AUTOSEAL technology for 100% leak-proof and 100% spill-proof performance. * Made from 100% FDA-approved materials. Top-rack dishwasher safe. * Dishwasher-safe base design grips table tops and reduces clanking.