Breathability
Breathability is the property that allows air to pass through both sides of a textile, and it is a performance characteristic affected by the gaps in the weave or knit, density, thickness, and finishing, influencing ventilation and resistance to stuffiness when worn.
Contents6 sections
Definition and Overview
Breathability is the degree to which air passes through a textile easily when a pressure difference occurs in the textile. In general, the larger the gaps in the textile and the lower the density of the threads and construction, the easier it is for air to pass through. When treated as an evaluation value, the term air permeability may be used.
Breathability is a performance characteristic related to ventilation while worn, but it is not the same as moisture permeability, which is the property of allowing water vapor to pass through. Not only the breathability of the textile itself, but also the lining, interfacing, pocket bags, and layering specifications affect the ventilation felt throughout the garment.
Features and Effects on Appearance
Textiles with high breathability allow air to pass through easily and tend to trap less heat in hot weather or during exercise. Coarse constructions, mesh knits, and lightweight textiles are easier to make breathable, but they may also make the skin or inner layers more visible and reduce wind resistance.
Breathability is not determined by the material name alone. Even with the same cotton or polyester, it can vary greatly depending on thread thickness, twist, weave or knit construction, density, whether there is fuzzy finishing, coating, and more. A cool-looking appearance or a dry hand feel does not necessarily mean high breathability.
Main Applications
Textiles that emphasize breathability are used for spring and summer shirts, blouses, dresses, innerwear, sportswear, and more. In uniforms and workwear, they may be designed with the wearing environment, level of activity, and durability in mind, including partial use or omission of lining.
Lawn, voile, gauze, leno weave, and mesh may be chosen as textiles that allow air to pass through easily depending on their construction and structure. However, performance differs depending on specifications and finishing even for textiles with the same name, so the actual product should be checked rather than judging by name alone.
Selection and Handling Notes
When selecting, check breathability along with sheerness, water absorbency, quick-drying performance, moisture permeability, wind resistance, and strength according to the intended use. When comparing numerical values, different test methods and specimen conditions make simple comparison impossible, so it is important to check data under the same conditions.
Thin textiles with large gaps may stretch, shift, or ripple at the seams during cutting and sewing. Try a fine needle and thread, and adjust presser foot pressure and feed. Shrinkage and construction deformation due to washing may also occur, so before mass production, perform a water relaxation or washing test and check the shrinkage rate.
Differences from Similar Terms
Breathability indicates how easily air passes through, while moisture permeability indicates how easily water vapor passes through. Water absorbency is the property of absorbing liquid water, and quick-drying moisture absorption is a function that helps absorbed moisture disperse and dry more easily. These are related, but are evaluated separately.
Waterproof and moisture-permeable materials are intended to block water droplets while allowing water vapor to escape, but some are designed to be less permeable to air. High breathability is not the same as high moisture permeability or waterproofness, so priorities should be set based on the required wearing environment.
Frequently Asked Questions
Does a textile with high breathability always feel cool?
It does not necessarily feel equally cool. Breathability is related to how easily air passes through, but the feeling of heat is also influenced by water absorbency, quick-drying performance, moisture permeability, cool to the touch, color, and looseness inside the garment. Check multiple performance characteristics according to the application.
How should breathability and moisture permeability be used differently?
Breathability is the property of air itself passing through a textile, while moisture permeability is the property of allowing water vapor to pass through. In summer items or sportswear that need to bring in air, breathability may be emphasized, while in outerwear for rainy weather, moisture permeability is checked while considering balance with waterproofness.
What should be noted when sewing thin textiles with good breathability?
Thin or open-texture textiles may stretch easily during sewing, causing seam puckering, rippling, or noticeable needle holes. Before actual production, test suitable needle, thread, and seam conditions, and use stabilizing interfacing or tape as needed to check the result.
