Rubber rain boots can oxidize, sun and high temperature, etc., which can accelerate the aging speed of rubber products and make them hard.Turn soft. Therefore, rain boots must not be exposed to the sun for a long time, and should not be exposed to the sun and fire. Also avoid contact with coal sleeves, gasoline, etc., because these chemical solvents will dissolve the rubber, making the upper sticky. When wearing, do not touch the hard objects such as broken glass, iron wire, nails, etc. After that, you cannot continue to use it.