Heck, now that the price has dropped to ten bucks I'll try 'em myself.

But if you're just looking for the lightest practical fabric that's comfortable, no bunching or crawling, and just a bit warmer but not sweaty, try the Nashbar knee warmers. They're fleecy feeling inside, smoother outside, but not thick. My legs are skinny so I got the mediums -- perfect fit. I might try Nashbar's arm warmers if they're made the same way -- my Pearl Izumi arm warmers are almost too thick for the typical Texas cool weather day, which can range from the mid-30s to 70s in a single day.