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Wind shirts (which can include jackets, pullovers, and hoodies) are thin, lightweight, and compact garments made with non-waterproof, breathable, woven nylon or polyester fabrics. The air permeability rate of such fabrics may have some impact on the perception of user comfort while wearing wind shirts. The purpose of this report is to investigate the relationship between air permeability, fabric porosity, weave type, and yarn structure via photomicrography and image analysis. This is not an exhaustive research study, but rather, an exploration of some of the fabric design attributes that have an impact on air permeability rates.

The air permeability rate (APR) of a e fabric is one measure of the fabric’s ability to allow airflow¬†through it in response to differences in air pressure¬†across the fabric face. APR is most commonly measured using the procedure described in ASTM D737, which creates a fixed air pressure across the fabric face and then measures the flow rate of air passing through it.

In contrast, the moisture vapor transmission rate (MVTR) generally defines a fabric’s ability to allow for the diffusion¬†of moisture vapor molecules through it in response to differences in moisture vapor pressure between the inside and outside faces. MVTR is most commonly measured using one of the procedures described in JIS L-1099, which measures the evaporation of moisture through the fabric in the absence of an air pressure gradient.

The general term breathability¬†is the fabric attribute describing excess heat and moisture leaving a user’s clothing system while active. Both MVTR and APR can affect the overall breathability of a fabric, and in some cases, are correlated. High levels of breathability are generally desirable for windshirts, which are designed to be worn in stormy weather when the high water resistance of a rain jacket is not needed. In addition, windshirts are usually made with fabrics having higher APR than fabrics used in rain jackets, allowing for better overall user comfort during high levels of physical exertion.

“The term ‘comfort’ is a nebulous one, which defies definition, but the sensation of comfort is easily recognized by the person experiencing it.”¬†– K. Slater, Comfort Properties of Textiles (1977)

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A wind shirt with high MVTR and high APR can be a versatile layer for a wide range of conditions.

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