Moisture Proof Fabric is also called moisture-proof pad. This product is not only waterproof, but also has many uses. For example, it can be used as a pad on the ground when going camping. When camping, you can put it on the tent to keep you warm, and you can put it on the floor at home to prevent stains, so this product has many useWhen the water vapor condenses into water droplets, the particles become larger. Due to the surface tension of the water droplets (the water molecules "pull and compete with each other"), the water molecules cannot smoothly escape from the water droplets and penetrate to the other side.