Based on the information available, CAT Workwear AU appears to be a legitimate business. It is the official site for Caterpillar work boots, steel toe work boots, shoes, and casual wear. The site offers a variety of products, including boots, shorts, pants, and more. The business has a rating of 4.2 based on 24 reviews. However, it's always a good idea to do your own research and check for more reviews before making a purchase. Please note that this information is based on the data available at the time of the search and may have changed.