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One more thing: You could actually make a test. Create 2 identical pants: One in the cotton and another in a 2L (a 2L material garment needs to be lined) or 3L material and seriously test the garments alongside each other. You might fint the clarification you need. The cotton could work just fine for your needs or you see clearly that – nope, you need the membrane material. Test and you will see:)