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MemBrain® is a waterproof breathable technology developed exclusively for Marmot. MemBrain® technology includes a micro-thin polyurethane polymer film that is laminated to high-performance fabrics chosen by Marmot to enhance their waterproof breathable properties. In order to optimize comfort in both wet and dry conditions, MemBrain® breathability adapts to your body temperature while remaining waterproof at all times.