Rec's for good acoustic foam / material?

Forums:

Looking for material to dampen sound in big "bouncy" room; as well as to mitigate leakage to outside exterior (neighbor's house) through windows.   Need 3 pieces of roughly 6x3 foot sections that are about 6" in depth.

Open to material that's been specifically designed for such applications; as well as "out of the box" solutions (i.e. mattress foam) that might accomplish goal.

I know someone who use "physical therapy mats" (flat on the "floor" side; a series of pyramids on the "patient" side.

Not sure about the efficacy (I never asked his neighbor).

Thank you both for tips.  Those CL foam panels could work, but looks like I'd need to buy them all up to get desired coverage / thickness ... which looks to be a bit on the expensive side for what I was looking to pay.  Although, not familiar with what acoustic material costs ... so maybe need to adjust expectations. 

Physical therapy mats are almost the correct width and length, but not sure if vinyl is a good non-reflective surface?  ... although could see them working as an under layer with something like highnote linked to as a top layer.

I hear that moving blankets work pretty well. 

The cl foam is about $2.50 sf. New costs about $6sf.

I had a friend with a studio, couldn't afford the pro foams available, so he just put up angled pieces of wood, redirect the sound into odd random directions  (especially the corners, where the sounds waves  seem to reflect the most).  It was actually too quiet, and he had to remove some, lol...

Druba I believe there are some smaller acoustical panels that do exactly what your friend did.

 

i also did a job with a roll of rubber matting that went between the framing and drywall. It was a bitch to work with, the roll must of weighed 600lbs.

 

i have also heard about double drywalling a room, but there must be a air gap between the two pieces of drywall. Down here they used a furring strip between the sheets of drywall. Need some long drywall screws