It can likely be purchased from any furniture re-upholstering store which can order exactly what you want from a distributor which would not otherwise do business with you on a one-time basis. Thicker cotton batting is available from upholstery supply stores and online distributors.
Yes, this is anecdotal, but I think we have enough data to say that UltraTouch doesn't work in speakers of any sort. Once each made the change to cotton batting all reported a dramatic improvement. So have a few other rebuilders with other speakers. Other Bozak owners who used UltraTouch have had similar experiences with reduced and abysmal bass response. As he above documented, the bass came back to the point he was bringing down low-flying planes with it, and the US Geological Survey arrived at his house to investigate earthquake reports similar to Tesla's resonator. So I convinced (pronounced "browbeat") Biggles into trying cotton upholstery batting. Yet this poor bass response from a Bozak was, in a word, impossible Bozaks produce so much bass that the surplus was historically exported to bass-deficient nations as part of our foreign-aid package. Bozak Cult nearly lost one of its charter members. Yes, such a horrible outcome very nearly came to pass. So much so that he was about to give up on his Bozaks. When Biggles used UltraTouch in his Bozak Sympony's he reported having exceedingly poor bass response. Using a hard(er) lining in a cabinet is equivalent to substantially reducing the interior volume of the cabinet without backwave absorption, which greatly degrades bass response.
Even insulation contractors complain about this in various forums and say it is poor insulation which has no trapped air. Not so with UltraTouch after opening it remains is a solid, dense mass with no loft and it presents a hard surface which is reflective to soundwaves instead of absorptive. When used in a cabinet the backwave can become slowed by, or lost in, the fibers. Fiberglass, rockwool, and polyester fiber fill are all materials with a great deal of loft. The fluffy nature of insulation and its ability to rebound after being compressed for shipment is commonly called "loft". This means that the material used for this purpose must be airy, not dense, and not reflective on the surface. Fiber insulation in speakers works, greatly simplified, by absorbing or by restricting air movement. UltraTouch is a poor material for backwave absorption in a speaker for a simple reason: it has no loft.
UltraTouch unfortunately is an Emperor's New Clothes situation. (Topic for another discussion.) But UltraTouch is unfortunately not the solution and much endlessly repeated dogma exists without any basis. To begin, I must say that I welcome cotton or other natural fiber alternatives to fiberglass and rockwool, which I regard as unsafe. He's a summary of what I've written hither and yon. As far as I know I am the first to debunk UltraTouch (aka "shredded denim") for speakers, certainly for Bozaks, but I am far from the last.
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