Boom Mat Undercarpet 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 vehicles 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. UC 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. UC 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 ) including vertical and overhead surfaces. UC is 3/8 thick and available in three sizes: 24 X 54 (9 sq. ft.), 48 X 54 (18 sq. ft.), and a Bulk 1 X 54 W; part numbers: 050100, 050101 and 050102 respectively. For the quietest ride possible, u se Under Carpet as a second layer over Boom Mat Damping Material . Features and Benefits 5.6 db(A) reduction... a 25% noise reduction over leading competitors product Perfect to use over Boom Mat Insulate your interior from heat and cold Provides additional sound deadening 3/8 thick What's in it for you... Maximum noise control Enhances stereo performance and sound A quiet and comfortable interior No mold or mildew issues Perfect combination of noise and vibration control Where to use: Firewalls Floor boards Transmission tunnels Behind rear seats Inner wheel wells Trunk floors Rear quarter panels NOTE: To customers ordering in BULK , Please note the number in the QUANTITY BOX in your shopping cart is the bulk length of your order in FEET. For example, by default, quantity is " 1 ". This would make your bulk order 1 ft x 54 in . wide. Changing the product quantity in your shopping cart to " 20 " would make your order 20 ft x 54 in . wide.