The breathability of microporous films depends on the formation of a tortuous path inside the films, which has billions of tiny holes per square centimetre. The size of these holes is smaller than the smallest raindrops and bigger than the largest water molecules. The breathability of monolithic films on the other hand, utilizes continuous hydrophilic laminates with membranes in between which absorb gases and water molecules on one surface, transferring the molecules through the film to release it on the other side.
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