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Patagonia Ultralight Down Shirt
$250, 6.0 oz, www.patagonia.com
At a feathery-nothing weight, this insulating (800-fill down), long-zip pullover with water-repellent finish provides plush insurance on those spring and fall fastpacking trips, when temps can dip and you’re chilled in sweat. Trim fitting, it is perfect for layering under a light shell or over a baselayer, and packs into its own softball-sized stuff sack. The only drawback is its lack of pockets.