This car sound deadening mat is composed of three layers of high-quality materials, including a 4mm (157.48mil) high-density closed-cell foam, paired with high-quality adhesive backing and backing paper. Each roll covers an area of 36 square feet, with dimensions of 15.7x330.7 inches, meeting the soundproofing needs of multiple areas with just one roll.The product features outstanding soundproofing, waterproofing, and heat insulation properties. It can effectively block 98% of radiant heat transfer. Its excellent soundproofing performance blocks external noise, creating a quiet driving space even in rainy or humid conditions. The superior heat insulation properties prevent heat from the engine, exhaust, and the summer heat, maintaining a cooler interior in summer and a warmer one in winter, enhancing driving comfort.n terms of installation and use, this sound deadening mat is easy to operate and can be flexibly applied to various parts of the car, such as doors, hoods, trunks, firewalls, etc. Its flexible texture allows for easy cutting and combination, adapting to different installation scenarios. Additionally, the product uses lightweight and odorless materials. When adhering to the vehicle body, it effectively prevents water vapor and air from getting trapped.