Boom Mat Under Carpet (UC) is a second layer sound deadening and insulation mat that will help you maintain a quality ride experience by preventing unwanted noise from being transferred into the vehicle's interior. In addition to its sound deadening properties, this two-layer acoustic material provides superior insulation keeping vehicles cool in the heat of summer, and warmer in cold temperature climates. Under Carpet is made up of a top layer of flexible, one pound per square foot mass loaded barrier material, and a bottom layer of high quality industrial acoustical marine grade foam. These combined materials offer the most ideal way to maintain a "new car" driving experience by eliminating squeaks, rattles, vibration and unwanted engine noise and heat. Under Carpet can be added under carpet, on fire walls, or anywhere in the interior of a vehicle where additional sound deadening or insulation is needed. For the ultimate experience in a quiet ride and interior comfort, Boom Mat recommends using UC over Boom Mat vibration damping material. UC can be mechanically fastened or tacked in place with Boom Mat Hi-Temp Spray Adhesive (# 010490, sold separately) including vertical and overhead surfaces. For the quietest ride possible, use Under Carpet as a second layer over Boom Mat Damping Material.