The double-walled insulation design ensures beverage can stay either hot or cold over time. Let you enjoy hot or cold drinks. It is easily swiped to open while keeping away from splashing. Closing the sliding lid keeps clean when do not use the mug. There is drinking hole on the top.The coffee mug is made of food-grade 18/8 stainless steel, liner of coffee mug will not produce any taste and will not rust, hand wash is recommended. The structure of the coffee mug body is sturdy, could be used for a long period of time.There are multiple colors to choose freely. Coffee mug is suitable for home, travel, office, lounge, bar, restaurant and many other occasions. It is also a perfect gift for Father's Day, Mother's Day, Birthday and Christmas.