I'm about to place a large order at Rip Stop by the Roll. 2 of the under-quilts I'm planning are sub-20 degree. I'm trying to determine which fabric to use for my outer layer to provide the highest wind resistance. Membrane 7 is listed as "Highly wind resistant -CFM of 6.3", yet none of the other fabrics contain permeability stats. While I like the idea of creating an ultra-light quilt entirely out of Membrane 7, I'm concerned about air-permeability for use in lower temp quilts, as my current <20 degree is made entirely out of Membrane 10 and I noticed decreased performance during a windy early spring hang. Does anyone know how M7 compares to calendared 1.0 oz HyperD vs M10 vs M15? Any suggestions on which material would give me the highest performance without the need for a UQ protector? Thanks in advance!
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