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Primaloft in the sleeves and the Gore Airvantage inflatable insulation system in the main body. Total weigh is 26 oz. It has waterproof zippers, typical handwarmer and Napoleon pockets, drawstring hem and pit zips. It inflates with a couple breaths using a tube mounted near the front zipper. It deflates by reversing the cap for the inflation tube.
Wore it every day 3 years all seasons. Wish the company that made these was still around.