Warm Tips:
1. It is NOT a thermos cup, having the lid prevents the heat from disappearing faster.
2. This coffee cup with lid is NOT completely leak-free if you fully reverse it because of the air hole on the lid. But the mug is still spill-proof, completely safe on the go or in the cup holder of car/bike.
3. Highly suggest not overfill the cup with hot drinks, and please open the silicone seal plug at top side before covering the lid, otherwise it would be hard to cover it properly and the hot vapor may be sprayed out