To make good quality foam underlay, its very important to have good foam materials first. Our main advantages are we have plenty sources of sponges and we only use colorful and high quality foams as our foam carpet underlay materials. You will never see any black or grey foams on our foam underlay. Material: Non-polluted high quality foam sponge Packaging: Roll packing with clear polybag Density for carpet underlay: 4lbs and up (64kg per square meter and up) Density for flooring underlayment: 6lbs and up (96kg per square meter and up) Thickness: 2mm and up Width: 1.37m or 1.83m (4.5 or 6) Length: Subject to customers request Color: Many colors available Design: Buyer design acceptable OEM Supply: Available SurfaceBacking Material: 1.Non-Woven fabric 2.Plastic film 3.Aluminum foil 4.Other materials Major functions and advantages: 1- Environmentally 2- Waterproof 3- Fire-retardant 4- Antibacterial 5- Anti-fouling 6- Noise reduction 7- Keeping off moisture 8- Keeping off sounds 9- Extends the life your carpet/floor