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Sleek new Summit Series® full zip, the Flux Power Stretch Jacket is an extremely warm stretch-fleece for vertical pursuits. Made from durable Polartec® Power Stretch® fabric, this soft, stretchy material is also super light and easily packable. Sport this jacket under an outer shell for maximum protection and warmth in brutal conditions. This product contains at least 90% bluesign® approved fabric -- a standard for environmentally responsible production.