Alpha Damp is overall 25% thinner than Damplifier Pro(our thickest CLD) but the foil is much thicker. while Damplifier and Damplifier Pro have 6.5 mil foil(for those who don't know, the foil is the "Constrained Layer" and a very important part of a CLD mat.) the Alpha Damp has a 10 mil foil, which is why it is more effective than the other two. Max Edit: It seems i overlooked Kirill007's post stating more or less the same thing haha. Sorry abou that! Great Products! Great GUYS! you two just made it more difficult im sure for this poor guy to decide Either way there is no wrong choice in this debate!