"totally not talking about you (or pcad, or botto, Machka, etc.) It just seems like a silly debate, and would be solved if people would just go see what works actually on the bike (but then BF would be deserted)"

The problem is, that the best I can tell, this is not supposed to work for me anyway (too humid, too sweaty), so testing it and getting negative results would be pretty meaningless.

"Think some more. Don't you think the mass of water that evaporates depends on surface area? Gedanken: which evaporates faster an insulated column of water 12 inches deep with one square inch exposed to the air or an insulated pool one inch deep with 12 square inches exposed?"

Re-read my post. If sweat is actually dripping off without evaporating, then you may have something, but then you're also probably going to saturate the fabric, contrary to earlier assumptions. And if it's all evaporating either way, no difference. Unless, that is, you assume that you will actually sweat more with the fabric, but that would imply you were hotter, too.

"(Also, you're experience is limited. There are plenty of people who wear light arm warmers for cooling.)"

You could be right. I'll have to watch for this and see.

Edit: Check here: http://www.bicycle-stuff.com/photo20...-H-H/page.html
Looking through a couple of dozen pictures, I'm seeing a bunch of bare arms, bare legs, and bare faces, and zero long sleeves, long pants, or cooling facecovers. I wouldn't say there weren't any there, but there's sure not many if any.