1. The material of this item is 304 stainless steel both inside and outside, the material of the lid is Tritan and silicon, all materials are food safety, BPA free.
2. This mug is vacuum, able to keep the water inside to be cold and warm more longer time.
3. The bottom is not round, there are four corners to make the shape to be more fashion.
4. The handle is connected by laser welding, in this way, the connecting position is more smooth.
5. The size of the mouth is big enough to put ice in it and easy for cleaning.