Patented. The clever design of our deep draw 3-in-1 Vacuum Insulator combines 3 functions into 1 unit. Use as an insulated coffee mug with the see-through screw on lid. Or convert to a 12 oz can or bottle cooler with the twist on/off rubberized ring on the bottom. Made from 18-8 coper lined stainless steel. Lead-free vacuum seal. Complies with FDA. 3.25" D x 3.25" W x 6.3125" H
