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Does every breathable sports fabric listing mean the same cloth?
No. Breathable sports fabric is cloth that moves vapour during exercise. Open knits and some membranes are different systems. Name the system. A mesh panel is not a waterproof-breathable laminate.
Can you skip sampling breathable sports fabric?
Exercise in the sample if the claim matters.
What should stay on the brief besides the keyword breathable sports fabric?
System, construction, mass, and lining. Using a rain shell as a training tee.