Hi vis vests come in a range of styles, from the very basic to the executive, depending on their intended use. They are generally used to allow people from outside of the work site to come onto site temporarily or to provide some high visibility workwear at short notice. Rather than go through the process of getting changed into full hi vis uniform, the visitor can simply slip on a vest and adhere to the safety guidelines whilst they are there. Another use is for members of management who might be expected to wear a suit or other formal wear. They can add high visibility vests over the top to keep both the smart office look and meet the designated safety standards of the work site.