Full of hot air?Put it to good use this winter with the new Airvantage technology from Gore, found in Burton's Radar Type Z jacket (800/881-3138; www.burton.com; $550) and Hugo Boss's Airvantage (800/484-6267; www.hugoboss.com; $995). When you feel cold, breathe into the hidden tube—it fills a maze of air chambers inside the coat to warm you up. —Jaime L. Gross
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