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We love an Indian summer as much as you do, but sometimes the fringe seasons aren't as ideal as you want. That's why the Micron 0 This item contains animal product.'s water-resistant down, rated for temperatures as low as -18C, ensures warmth long past the vagaries of shoulder-season weather. The Micron 0 is an ideal choice for trips, climbs and treks when sub-freezing weather is imminent.