If you are going to compare similar products you should look at our entry level mat, Damplifier, not Damplifier Pro. Dynamat Extrme 1.67 mm thick .45 lbs psf 4 mil foil 300 degree heat rating Damplifier 1.25 mm thick .45 lbs psf 4 mil foil 500 degree heat rating. Damplifier is slighty thinner than Dynamat Extrme but weighs the same. This is becuase we introduce a defoaming agen in to the butyl while it is blending and re reduce the air content from the formla. Since there is less air bubbles in the adhesive it is very dense. If we wanted to, we could leave the machine on foa few hours longer, and not use the defoaming agent and we could easily turn a 100 gallon batch of butyl adhesive in to a 150 gallon batch. Then, we could apply that to the foil at a greater thickness and could make the claim that our product is the thickest around. Problem is, there would be no difference in weight. so even though a the product is thicker you don't get any better results since there is just as much material as the thinner batch. This is why we often encourage people to compare the weight of a product rather than the thickness. Obviously there is more to vibration damping than just weight, but the more it weighs per square foot, the more you get for your money. Look at Damplifier Pro. 1.75 mm thick but it weight .65 lbs per sq foot and has a 6 mil foil heat shield. Nothing in the industry comes close to those specs. ANT