The Welly® Copper Vacuum Insulated Tumbler features durable, 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. Removable stainless steel infuser included. Features maximum bamboo for timeless look and comfortable grip. It features a screw-on lid with flip-top closure and a wide opening for comfortable filling and pouring. Perfect for ice cubes and fits most standard car cup holders. Due to the nature of bamboo and material variance, there might be a slight difference on laser engraved logos. No two pieces are alike which makes each piece unique for you! 12oz. And it's more than an awesome bottle. Welly contributes 1% of sales toward construction of wells in areas without clean water. Learn more at wellybottle.com.