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Must-Have Gear: Fall/Winter

Lighter, tougher, and smarter—that's what characterizes this season's best equipment. Whether it's an improvement on nature (such as water-resistant down) or more sophisticated use of electronics (such as a headlamp that anticipates your needs), these 24 items are better attuned to keeping you fresher, safer, and happier in the outdoors. —Steve Casimiro