First Ascent Expedition-Weight Thermolene Hoodie

Your base layer is the single most important garment on the mountain because it directly touches your skin. Made from a blend of polyester and Cocona, this long-sleeved top is soft and comfortable, with just enough weight to handle frigid days. It's quick-drying, odor-resistant, and feels perfectly broken in the first time you pull it on. Buy two. [$60; eddiebauer.com]