Solareye wrote a review of Outdoor Research Peruvian Hat on February 11, 2009
I've found this hat works in most circumstances from skiing to under a climbing helmet. The Windstopper certainly does cut down the wind, but as with all membranes reduces breathability somewhat and hearing as well (though you can just fold one of the flaps of if you need to catch what someone is saying). I found the sizing to run slightly small and went with a large instead of a medium. I can get it to come down to my eyes (if I try), but it is cut in such a way that it never does this on it's own. Having the larger size also lets me put a lighter liner hat underneath (Arc'teryx LTW Beanie in my case) and fits perfectly.