Synthetic insulated jackets provide reliable warmth when the weather turns sour. Unlike down — which loses its loft and insulating power when soaked — synthetic jackets trap heat even in a downpour and breathe efficiently during high output. Over the past nine months, GearJunkie Editor Chris Kassar and lead tester Ryan Kempfer put 15 synthetic jackets through the wringer. They logged 60 days and 350 miles hiking, skiing, biking, and climbing in …
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