I have been looking at some of the ultralight trail runners and tested a pair a couple weeks ago.
The toe area has VERY thin material and lots of fine dust powder went through the shoe and that evening my feet were filthy.
It would be nice to find a pair of ultra thin socks, like gore tex socks and then wear them over my main socks to prevent my feet from getting dirty.
This would FURTHER allow the shoe to go even lighter with material since I no longer have to worry about dust.
And lighter material means the shoes dry quicker! Which is a clear win!
Goretex socks also seem to be a win in that I can walk through streams without getting my feet wet. Some reports were saying that a small amount of water gets through but your feet are WAY drier this way.
Thoughts?

