Ty Nelson wrote a review of Patagonia Capilene 4 Expedition Weight Zip-Neck Top - Men's on July 23, 2014
I've written a few other reviews on Capilene 4 pieces, wanted to comment here though. Zip necks tend to be Patagonia's best seller among base layer tops, and this is one of the best offered. Cap 4 fabric is super warm for how light it is, and incredibly breathable when you need it to be. At first glance it doesn't seem super warm, the fabric is a high/low grid and is practically see through, but it definitely packs a punch.