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By the Numbers: The Myth of Air Permeability in Windshirts
If one of your objectives in selecting a windshirt is eliminating moisture vapor, your selection should rely more heavily on Moisture Vapor Transmission Rate (MVTR) than Air Permeability Measurements (APM / CFM).
Up to 40% off hiking and backpacking gear:
REI Sale June 21 to July 4:
