The material used is an excellent insulator Sound insulation allows you to deal with both heat and cold. This is particularly important in hot climate areas. Well-insulated interior is a pledge of high comfort while in vehicle. Liner heat shield material will solve the problem of excessive heating if your car is equipped with a powerful engine and enhanced exhaust system. It is also easy to use liner as the hood insulation (hood liner). Features: This insulation foam will improve the riding experience in your vehicle by reducing engine noise, tire whine, road noise, wind noise and will significantly improve the overall vehicle refinement and sound quality. As well as improve the vehicle acoustics, this high performance insulation foam will ensure your vehicle stays cooler in the summer and warmer in the winter, making your ride more comfortable. Glass fiber foam has the same characteristics and excellent noise insulator properties as rubber foam. It absolutely doesn't absorb water & has no odor unlike polyurethane foam. It is light weight, oil and petrol resistant. Made of high quality material with the adhesive backed surface, this insulation foam is easy to cut, peel and apply, and it is water resistant and flame retardant. This sound deadening foam is ideal for hood, ceiling, door, cockpit floor, tailgate, fire wall and U type wall, front mudguard, front and back wheels. With high noise reduction and thermal insulation properties, it is a good replacement for the old one and also a needed spare part for your car. Specification: Material: Foam Cotton + Glass Fiber Size: 40 * 40inch Thickness: 5mm/0.2inch Package Weight: approx. 450g Package list: 1 * Sound Heat Insulation Foam Note: It is easy to install, but professional installation is highly recommended.