This double-walled vacuum mug made of SUS304 stainless steel keeps drinks hot for up to 5 hours and cold for up to 15 hours. Easy to open with the push of a button! It can be opened with one hand, so you can quickly hydrate when you want to drink. The lid can be locked to prevent it from opening accidentally in the car or in your bag. The lid is easy to keep clean and can be washed in the dishwasher. The stainless-steel mug has a large mouth, so it is easy to put in large ice cubes, and the inside is easy to wash, so it can be kept clean. The one-push button system allows you to drink directly from the mug conveniently and safely with one hand. The mug is a circular size that can be placed in a car drink holder. It is slim, so it is easy to hold with one hand and is easy to carry in a small bag.