Top hot rod and custom car builders use Dynamat because they know it makes for a cool, quiet, comfortable cruising environment. Doors & trunks seal better, rain & wind are barely noticeable, and cars feel more solid when using Dynamat insulation. Reduce road noise & vibration by applying Dynamat insulation to a vehicle's interior sheet metal. Dynamat Xtreme is a patented, lightweight elastomeric butyl and aluminum constrained-layer vibrational damper. Highly-resistant to aging, Dynamat Xtreme conforms and fuses easily to sheet metal & other hard substrates. Dynamat Xtreme is best for temperatures between 14° F and 140° F (-10° C to 60° C) yet withstands -65° F to 300° F (-54° C to 149° C).