I didn't mean it was made of neoprene, only that a heavy-duty skin would be more thick/durable; I can see how this confused you, I should have been more careful with my wording. Rather, from their flier (http://www.whitesdiving.com/index.php?id=342&cid=593&site=4), there's an available "Hybrid Tech skin for higher abrasion resistance and added thermal protection." I have no idea what it's made of, though I doubt it would be compressible neoprene (what would be the point for a shell suit?)
Still the question does remain, is the removable-skin idea a jack-of-all-trades-master-of-none situation?
It's neoprene, I was at DEMA, I asked.