The bottom layer of PVC floor is generally divided into two types. One is a dense bottom, and the other is a foamed bottom. The materials are all plastic. The dense bottom is hard, mainly used in offices, shopping malls and other places with high traffic, and is characterized by strong wear resistance. Foamed feet are comfortable and elastic, and are mainly used in kindergartens, early education and other places with special requirements on the ground, such as hospitals, gymnasiums and activity centers. Please add QQ463236936 for details, I hope it will help you.