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The breathability of a material is its capacity to eliminate the water vapour generated through perspiration. During intense physical exercise, highly breathable clothing is therefore essential to avoid staying wet. Breathability is measured in terms of it Evaporative Thermal Resistance (R.E.T.) coefficient. It measures the resistance of a fabric to the evacuation of moisture. The lower the resistance (hence, the lower the coefficient), the more breathable the fabric!
In order to benefit fully from the technical properties of your clothing, you must also manage your different layers of clothing according to the level of effort you make.
(NB: some brands also use the M.V.T.R. index ."Moisture Vapour Transmission Resistance" to measure the breathability. This index measures the quantity of water that a square metre of fabric lets through in 24 hours. The higher the index, the more breathable the fabric. For example, a garment with an M.V.T.R. of 5,000 is not very breathable, whereas a garment with an M.V.T.R. of 30,000 is extremely breathable).