Just because this is a jacket thread, I need to toss this in, even though it is not the jacket you are looking for.

http://shop.pearlizumi.com/product.p...uct_id=1638745

This jacket weighs nothing. It folds up so small you won't know it's in your pocket. I am amazed how often it's the perfect jacket, just enough to take the chill out of the day. It isn't very rain resistant, but otherwise rocks.

Here's blog post about the perfect clothing, with a photo of the jacket.

http://ccorlew.blogspot.com/2011/01/...r-weather.html