Extreme heat affects more than how people feel in their clothes — what they wear can change how effectively the body cools itself through sweat evaporation. However, there is no single “best” fabric for all situations. Researchers cited by The Associated Press (AP) emphasize that the most important factor is clothing design that doesn’t hamper sweat evaporation, alongside properties like airflow, moisture handling, fit, weight, construction, and even color.
Here are several key takeaways from AP’s study:
- Lightweight, breathable, high air-permeability clothing helps air move to the skin and supports evaporation. Open-weave and loose-knit structures generally perform better than tightly woven fabrics, and heavy finishes that block airflow reduce cooling.
- Moisture management matters, but “wicking” isn’t always equal to “cooling.” Moving sweat away from skin may feel drier, yet evaporation farther from the skin may reduce direct cooling.
- Fit should match activity: looser fits can boost airflow during sitting/standing, while tighter fits during exercise may support faster evaporation depending on the garment and context.
- Cotton vs. polyester isn’t universal: cotton absorbs sweat and can feel heavy when saturated; polyester can dry faster via engineered moisture transport, but untreated polyester can become uncomfortable as sweat accumulates.
- Sun exposure adds another layer: loose, ventilated coverage can reduce UV risk, and lighter/reflective colors can reduce heat gain from sunlight. Label terms like “cooling” may reflect a temporary skin-cooling touch effect rather than sustained performance.
What Does This Mean to Global Fashion Traders?
The “cooling” claims are especially relevant to global buyers and suppliers engaged in the fashion, garment and textile industry. Some practical ways to work it out include:
- Require specs beyond fiber content: air permeability, knit/weave density, finish chemistry (no airflow-blocking treatments), moisture transport behavior, and garment weight.
- Test for performance under realistic conditions (high sweat + direct sun + different humidity levels), since “cooling” claims can be misleading without evaporation/reflectance/breathability evidence.
- Build assortments by use-case: outdoor sun coverage, commuting, light work, and exercise each favor different constructions and fits.
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