Flash Gear’s Fluorescent green safety vest, reflective stripes are optional for low light conditions, but do not define the meaning of "Hi Viz" clothing. An airport worker with high visibility vest near an aircraft. High-visibility clothing, sometimes known as "hi-viz", is any clothing worn that is highly ... of clothing with high-visibility features include railway and highway workers. However, other construction workers in highway/road construction work zones are also ... will have addition