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Cotton fibers have fine sizes ranging from to in microns or 2.8-4.5 denier. This finer size makes cotton fiber feels which is a comfort. Because of its molecular structure (-OH), cotton fiber has high moisture that is why cotton fabric is breathable next to skin, which is related to serviceability. However, when cotton gets wet, it drys and stays wet/heavy, therefore, it is not the best choice for exercise product design