the Zephyrr fabric isn't really windproof or waterproof, but "resistant". Eventually water will work its way through, and it's windblocking abilities aren't as good as something that's truly windproof. In addition, the Kodiak fabric used provides some bulk and insulation from the cold, so take that into consideration.
Personally, I prefer jerseys made of the heavier Kodiak fabric, and use just a windproof/waterproof shell for an outer layer, preferably with enough ventilation from pit zippers and back zippers that you can adjust if you're overheating. PI doesn't make it any longer, but I'm using their Instinct jacket, which is wind and waterproof. Might be able to find still online, and perhaps marked down a bit. Other swear by jackets from Showerpass, or others made from Event fabric, buit those are much pricier than the Instinct.
Found one online here http://flyingfishbikes.com/itemdetai...gId=39&id=3082
but it's pretty much full price. You can probably find something else equal or better for the price they're asking.
And then I use a variety of baselayers/jersey combinations depending on temps. I have a PI Vector jersey, which is constructed very similarly to the Barrier jacket, with AMFib windproof/water resistant front, and Kodiak back, which I wear under the shell on really cold,windy days. Gives me two windblocking layers, but still breathable, not as impermeable as the windblocking stuff that uses a membrane sandwiched between fabrics.
Layering is the key, rather than one heavy insulating jacket. That said, I did buy a heavier Sugoi jacket made from one of the new softshell fabrics, which does have a windproof membrane, that I plan on trying out this season. Got it on closeout from Campmor at a price I couldn't resist.
Last edited by rufus; 10-17-07 at 07:41 AM.