Our high visibility safety vest are ANSI approved for workers on or near roadways with vehicle speeds between 25 and 50 mph. We also carry non approved safety reflective vest for other applications such as parking attedants or special event staff. There are certain classes that these reflective, hi-vis vest fall on. Here are some examples of the classes. Class 1 is good for full and undivided attention to approaching traffic. Class 2 safety vest is for workers where greater visibility is desired during inclement weather conditions, complex backgrounds are present. And Class 3 are for workers that are exposed to significantly higher vehicle speeds and/or reduced sight distances; the worker and vehicle operator have high task loads, clearly placing the worker in danger.