Built with GlenGuard Hi-Vis Static Dissipative Modacrylic fabric which is patented and inherently flame resistant. Designed to make safety vests cooler and more comfortable without sacrificing protection. The fabric is designed with a 10mm carbon core grid-shaped fiber which works to dissipate a potentially harmful static charge allowing safe work in potentially combustible environments. The 2" 3M Scotchlite Retroreflectivity Material helps the eye perceive objects in low-light conditions when illuminated by a light source.