User Review: Patagonia Men's Puffball Sweater (pull-over)
Price Paid: paid $85 ($130 retail?)
This is an excellent product. It is vastly lighter and warmer than fleece, and will pack into a 5x7 stuff sack. It is almost as warm as a down jacket, but with none of the disadvantages of down.
Only complaint: the thin shell is a bit delicate (but what do you expect for something that's intended to be super light?). Wear it under a shell it you expect abuse.