Standard Class 3 Safety Vest Hi-Viz Green MediumThe class 3 safety vests are designed to protect workers by providing them with maximum visibility. these vests are designed with the most hi viz material coverage and reflective stripes for workers exposed to complex work environments. Class 3 vests are required in environments with high speed traffic high risk environments and where the worker must be visible through a full range of motions at a minimum of 1280 ft.