Zojirushi stainless steel mug features Vacuum insulation that keeps beverages hot or cold for hours. Easy-to-clean nonstick coated interior. Tight fitted flip open lid keeps beverages hot or cold. Safety lock to prevent the lid from opening accidentally. Stopper disassembles for thorough cleaning. Air vent design on the opening allows for beverages to flow out smoothly. 2-Step lid release process minimizes Dew spattering from the lid. Wide mouth accommodates full-size ice cubes. Compact design takes minimal space while maximizing Capacity. 5 year warranty on heat retention (for a period of five years from the date of original purchase; Product must be used within the us or Canada). made of BPA-free plastic and stainless steel. Language: box in Japanese, instruction manual in English, Japanese, Chinese (traditional & simplified).