1Durable Material: The paper cup cover uses high grade heat insulating paper material, which has nice thermal insulation performance and can effectively protect the user's hand from being burned. 2Adjustable Design: This paper cup sleeve uses a jack design, can adjust the diameter of the sleeve according to the size of the cup, adapt to different sizes of paper cups, convenient for users to use. 3Efficient Thermal Insulation: The corrugated structure of the paper cup sleeve provides additional thermal insulation, effectively blocking heat transfer, keeping the coffee warm, allowing users to enjoy the taste of hot coffee. 4Easy to Use: User can easily put the paper cup cover on the coffee cup and discard it directly after use, avoiding the trouble of washing and cleaning. 5No Pollution: The paper cup sleeve is made of degradable materials, which is friendly to the environment and will not cause pollution.