Because you're not your best before coffee!! 20oz tumbler. Picture shown is matte glass. Tumbler can be made in matte glass or stainless steel, double walled. Stainless keeps Drinks cold up to 24 hours and hot for up to 8 hours. Sliding close lid and a straw.
Hand wash only, mild soap, non-abrasive cloth
Not microwave safe
Dishwasher is not recommended to maintain cup integrity
