I dunno there Mr. Official NOLS guy, I thought I might have felt a hint of a breeze once or twice while I've been out climbing in the cascades, and I could be crazy, but putting on my windshirt seemed to prevent that wind from cutting through my baselayer and making me chilly, but then again, I ain't an official NOLS guy with "experience in the outdoor retail industry", so I could be wrong. Those wiley, wacky retailers - it's just like them to make a product for rain and call it a "wind" shirt. SHeesh. They sure are dumb.
ps - what does the "e" stand for at the end of your name? "Evicted" perhaps?
pps - Crash, sorry, but it doesn't seem like you are getting very good advice on cc.com on this issue. Perhaps you should go talk to someone who knows what the fuck they are talking about. I recommend Jim Nelson. I recently read about the Montbell Ultralight Windshirt (2.6oz I think) with a supposedly 100 wash-proof DWR coating and a full zip. Might wanna check that one out. I've got the MEC Genie windshirt that Dru talks about below and it does the trick and was cheap. Cheers.