Reflective material was first introduced back in the 1930's for use on stop signs and asphalt and by the 1980’s, had evolved into silver piping on sneakers and backpacks. The reflective material is created with tiny spherical glass beads (1/2 the size of a human hair). Made from optical-grade glass, these perfect microscopic spheres are coated on one side with aluminum and then organized aluminum-side down and adhered to the material to create a reflective surface. The process allows light to bounce directly back to its source. No matter what angle the light strikes the material, the wearer is illuminated and seen.
That means that when the light from a car's headlight shines onto the strip, almost 100% of the light will reflect off and go directly back to the source. There's no diffusion, no waste, all the light bounces back to the driver.
Soon after, it was seen in high-end jackets, running gear, biking equipment, and professional safety uniforms. Although more and more industries and manufacturers were beginning to use it, reflective material stayed the same skinny cord or patch of silver material it always was.
In recent years, there have been several incidents of sanitation workers being hit. According to the analysis of accident investigation, it is found that accidents occur at night or in the early morning hours. Besides the driver's illegal operation, the clothes of sanitation workers are dark and undetectable, which is also the cause of the accident. For this reason, sanitation workers wear the reflective vest, providing a lifeline for their safety protection.
The sanitation worker changed into a mesh reflective vest. This kind of net eye vest is orange-red, by the net eye cloth that breathes air is made, before and after all stick to having 3 PVC to reflect a light lattice, have the function of warning to reflect a light, more conspicuous than the original thick and wide sanitation overalls, lighter and smaller. The materials used on the reflective vest are small lens balls, which can be returned by the original road when the light hits them. It makes it easy for the driver of the vehicle to find the wearer and avoid danger. It is usually worn by traffic police or sanitation workers and road construction workers.