This product comes in Polyester fibers are used to make soft, fluffy, acoustic and thermal insulation products in ether rolls, batts or sheets. For soundproofing and acoustic purposes, the product is made at a heavy density. Generally, the heavier the density the higher the soundproofing performance. Soundproofing Products Polyester contain no added Formaldehyde Binders provides better soundproofing over large areas. Thin foam, over a large area, has less of a chance of distorted and muffling the sounds reverberation. The uniform wedge design help trap airborne noise while alleviating flutter echo and slap back. This foam is ideal for spot-treating production studios, practice rooms or home entertainment centers. Also, this foam helps with smaller agitation echo complications. It is tested to effectively eliminate sound waves and flutter. Purchasing your own foam is the best way to tune your area without hiring a professional acoustician. This Foam will not deteriorate or fall apart over time. All that is required is dusting over long periods of timeever you turn on a source emitter (like your speakers), you're essentially filling the room with energy (motion) that bounces off of every surface available. Bass traps work by providing resistance, generally in the form of an insulation material with the right properties, specifically proper gas flow resistivity. When the energy in the room encounters the insulation material, friction causes the kinetic (motion) energy to be changed to thermal (heat) energy, which results in a loss of amplitude. That reduction in amplitude brings peaks down and valleys up by reducing the strength of one or more interfering waves. We experience that as a reduction in volume as peaks are decreased and an increase in volume when valleys are brought up.