You want to keep any small particles away from electrostatics, which is why velour pads or anything that can shed small particles is a very bad idea. On the other hand Stax does use fairly good dustcovers over the drivers - even older Lambdas that had the inner foam rot out usually don't have issues with stuff getting into the drivers. The Koss ESP950 on the other hand...
Maybe I'm the least sweaty fool in the universe but I can wear the O2 for hours at a time without any sweat issues. The old SR-404 I had made my ears itch after a few hours though.
Point taken. Given that the drivers work on the same principle as some air filters, they're naturally going to be dust magnets if not properly protected.
I've thought about at least getting some genuine leather pads, but I'd rather hold off on that until I have a stock SR-Lambda to put them on.