Okay, hang on a sec. Ethan, Glenn and I, among others have actually done quite a bit of research on these guys, and the results were not good. Ethan actually tested their stuff and exposed their testing data as a bald-faced lie. Please note that I am not bashing foam on general principals; the right stuff bought from a reputable manufacturer (RPG, Auralex and Sonnex, to name a few) works very well in most cases (though not so much for bass trapping), but the cheap stuff is NOT, I repeat NOT AT ALL the same stuff just without the brand name. The reason that the data is the same is because Foam by Mail lifted the data from the Auralex website.
Lest I be misconstrued as a foam hater or something, go do quick search on "Foam by Mail" over at Gearslutz. See what you get.
Frank