Personalize Milo Copper Vacuum Tumbler 20oz for promotional swag giveawayDurable, double-wall stainless steel vacuum construction with copper insulation, which allows your beverage to stay cold for 24 hours and hot for at least 8 hours. The construction also prevents condensation on the outside of the tumbler. Easy sipping, push-on lid with slide closure. Wide opening for comfortable filling and pouring. 20oz.