The difference between the mass back upgrade and the standard poly backed carpet is the addition of sound deadening backing material called "mass backing". Mass backing material, which is approximately 40 mil thick, is heat bonded to the back of the standard poly backed carpet. It's purpose is for additional sound deadening and heat shield. It also makes the carpet's overall weight heavier due to the addition of the backing material.  It is an upgrade the we highly recommend on any molded carpet and is our best selling upgrade. 

Each style carpet, whether you order the standard poly backed or the mass backing upgrade option, will wear as long as your factory original factory carpet did.

The carpet pile is approximately 1/4" deep and is identical between the two products. Included in each set is heavy 40 ounce jute padding for the floor pan areas. After installation, you cannot tell by looking whether you have the standard poly backed carpet or the mass backing upgrade option on your carpet, however, the mass backing upgrade adds sound deadening and heat shielding properties that are not available with the standard poly backing.

If you are looking for additional sound deadener for your vehicle, then the mass backing upgrade is the product that you have been looking for. It saves time--you don't have to lay down sound deadener...then install your carpet, you can do it in one step. Mass backing is a product that we highly recommend, however, the standard poly backed carpet wears equally as long and is the identical carpet without the extra sound deadener!

Some late model vehicles (1990-present model year) have mass backing issued standard from the factory and we recommend that if your vehicle has the mass backing, that you replace it with our mass backing upgrade. You should look on the back of your original carpet to determine if you do have the mass backing on your vehicle now. If you do, it is highly recommended that you replace the carpet with the mass backing upgrade. The mass backing upgrade is available at an additional cost, but does not take any  longer to ship. Most carpets ship in 24-48 hours after your order is received. The majority of our customer's have their products in their hands in 7 days or less, of course, that is dependent upon where you are located in the US.

Mass backing will be applied to molded carpet and any piece in your carpet set that is made in a mold.  Mass backing cannot be applied to any die cut pieces (pieces that don't have molding such as a flat cargo area floor carpet or flat side panels, if the set you are ordering comes with these items) or "cut & sewn" style carpeting since mass backing is applied during the heat process.

Our carpet and mass backing is produced exclusively by ACC Auto Custom Carpets, who has been the leader in the aftermarket carpet industry for 30 years. We do not offer carpet made by any other manufacturer as other websites do.  Insist on genuine ACC Auto Custom Carpets products to insure the highest quality available and order from Auto Interior and Upholstery for the most professional and knowledgeable sales staff in the industry who can answer your installation questions after the sale.