the_beast is right. The more mass (weight) that the foam has, the better. Light foam won't do anything for noise or at best will muffle it a bit. The high end Acousticpak products have one or more layers of ultra-dense polymer (basically synthetic rubber) in them.
Walls are lined with what to dampen noise (in apartments, hotels, or recoding studios)? That's right, not foam, rubber and in the past, lead. Density is your friend here.
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