In addition to wicking features, which actively pull moisture away from the body, the breathability of a fabric plays a significant role in keeping workers cool. Breathability refers to a fabric's ability to facilitate air movement, thereby enabling efficient moisture evaporation from the skin's surface. This attribute is particularly pertinent in environments where workers are susceptible to overheating. Fabrics engineered for high visibility purposes, such as those crafted from polyester mesh, possess superior breathability, permitting heat dispersion and maintaining optimal body temperature regulation. Mesh fabric has a loosely woven or knitted structure with a pattern of evenly spaced holes or gaps. These openings are deliberately created to allow increased breathability and airflow. Conversely, non-breathable fabrics impede airflow and trap heat, heightening the risk of heat-related ailments like exhaustion and heatstroke. 

Hi-vis apparel can also include breathability design features. This may include vents that increase air circulation, segmented reflective tape that has more airflow than solid tape and loose-fitting designs that also increase airflow. In some instances, it may also be preferable to reduce layers and opt for a single hi-vis shirt instead of layering a hi-vis vest over another shirt.