De Sousa et al. 2014, Moisture-wicking fabric in the heat

Acute exercise study comparing a synthetic moisture-wicking shirt with cotton during moderate exercise in the heat. The wicking fabric retained less sweat and produced a statistically significant reduction in rectal temperature during the final 15 minutes of exercise, demonstrating a genuine thermoregulatory advantage over cotton in hot conditions. A small, single-intensity study measuring physiology, not race outcomes. Limited.