A plastic bottle with steel inside is used to keep the water cool It is useful for athletes #IK68A plastic bottle with steel inside is used to keep the water cool It is useful for athletes #IK68 Wide Application: The package is convenient and firm, and not easy to slip. The product is suitable for most bottles on the market. suitable object: It can be applied to a variety of heating materials, and it can be used for water, mineral water bottles, milk boxes, etc. Intelligent constant temperature design: Precise water temperature control for easy