PVC (polyvinyl chloride) rainwear (rainwear with a rubber surface) is used to soften hard vinyl chloride resin into rubber. Plasticizers such as phthalates are added.If an object containing a plasticizer comes into contact with another plastic for a long period of time, it will migrate to the other plastic and deteriorated. The transition is accelerated, especially in high temperature environments.When PVC rainwear and gel cushions are used as a set for a long period of time in high temperatures, rainwear plasticizers can deteriorate the surface of the cushions.By hanging the cover on the cushion, you can prevent the PVC rainwear from coming into direct contact with the cushion and increase the durability of the cushion.