Capilene Expedition Weight
Capilene Expedition Weight is indispensable as a base layer for extreme conditions. It also makes an excellent midlayer. Sized for an against-the-skin fit; buy a size up if you intend to wear it as a sweater. This season the zipper has smoother action and the pull tab locks in place so it won't come undone without your permission. And the interior facing has been eliminated to reduce bulk and improve breathability.