SUN-FLY 380ML polymer tumbler adopts double wall technology. There is a space between outer and inner to provide heat insulation. High-end polymer material is applied to the outer wall, meaning you can customize high quality dye-sub image onto the tumbler body. And the whole cup body is full-size sublimatable with seamless pattern, in easy process using HSB system. Inner wall is made of PE material that can meet food grade safety standard, it can be strong and stable under high temperature. Lightweight and easy to carry, it is suitable for various occasions as perfect gift to yourself, your family, friends, and partners, on graduation, party, etc.