Description This product is made of elastic fiber cloth, which can effectively keep warm, heat insulation, prevent scalding, prevent scratches, falls, and protect the cup. It has good elasticity and wide application range. It can be used in a variety of cups (the diameter of the cup cannot exceed the diameter of the cup sleeve, otherwise it will not fit in ). There are vent holes at the bottom, which can better exhaust air, and the cup sleeve can fit closely with the cup. The rope design can effectively solve the problem of inconvenience to carry the thermos cup. Specification Name: rope heat insulation water cup cover Material: fiber cloth Product category: water bottle set Colour: Black Size: 500ml (length 18.5*diameter 6.8cm); 1000ml (length 21*diameter 8cm) Application: vacuum flask, water bottle, coffee cup, milk bottle, etc. Features: heat preservation, heat insulation, easy to carry Package includes: 1 piece