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Can you post a direct link to the cotton panels? I took a look around the site and didn't see them in any prominent place.
Cotton can be used successfully in acoustic treatment; I've used the Ultratouch cotton before for absorbers and gobos with great results. The Ultratouch specs out really well and is quite affordable compared to rockwool or 703.
So yes, without seeing specs there is a good chance it works fairly well.
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