This amazing product can be custom printed with a full-size image on its polymer inner tank by using regular sublimation printing technique, which lasts longer than printed on a piece of paper. This great function improves the photo quality to a state-of-the-art level, and eliminates all visible defects (gaps, wrinkle and color fading) that could happen while using a piece of insert paper. The outer shell of this tumbler is made of polymer material and features a high gloss crystal-like finish, making the inner printed image more attractive. The photo tumbler has a double wall construction that helps keep hot drinks warm while keeping hands cool. Moreover, this tumbler is very easy of assembly without needing any additional tool. Meanwhile, this product is strictly controlled on safety issue with standard of FDA, EU, CA65, etc.