From what I understand about it, it absorbs the frequencies as rug and carpet.
4k? 6 or 8k? What I also find interesting as was pointed out when I started reading about this stuff, is that they don't show test results for there products.
What are you actually doing?
I would suggest reading up from that link and the studio/acoustics forum.
Take your time, take some measurements, read some more, do a few weekend projects making some traps and absorbers....read some more...take more measurements...
Personally, I started reading up on this last February to attempt to "tune" my room.........Ripped the room a part, build absorbers and traps,
measurments........several months of work...... It's still a issues acoustically,
but it's better than it was and I continue reading for when I hit it again in phase two.
Like every, it takes time.
So don't sweat the foam......live and learn......educate yourself......and work on it as you can.