Sierra Designs

One of the biggest innovations of 2012 is water-resistant down—and Sierra Designs is leading the way with its DriDown feather, which stays dry 10 times longer than untreated down and dries 33 percent faster. The Gnar Lite DriDown Jacket doubles as an outer layer for brisk days and a cozy, insulating mid-layer for when winter blows in.

—catharine fleury