From fine merino-wool base layers for comfort to ski shells that keep the elements out, head straight to Patagonia, where the emphasis on quality and performance doesn't compromise the brand's dedication to the environment. Like the Nano Puff Pullover (pictured). Made from recycled polyester and PrimaLoft One polyester fill, this wind- and water-resistant insulating layer is lightweight and warm, and compresses into a small square for easy packing. $150, Patagonia, 1431 15th St., 303-446-9500, or 1212 Pearl St., Boulder, 720-479-2387, patagonia.com