Geo Tumbler has Double-wall Vacuum Construction with Copper Insulation Which Means It Keeps Drink Hot for 8 Hours & Cold for 24 Hours. Construction Prevents Condensation on Outside of Tumbler. Easy Sipping, Push-on Lid with Slide Closure. Wide Opening for Comfortable Filling & Pouring. Volume Capacity is 350 Ml. This Item is Not Dishwasher Safe. Presented in an Avenue Gift Box. Stainless Steel Metal. Minimum Quantities Apply.