Experience the ultimate in warmth and comfort. These all-in-one overalls feature a -60°F comfort rating, padded insulated knees, fleece lined pockets, adjustable suspenders and a waterproof zippered pocket that's perfect for cell phones. Stay safe in low visibility environments with Ansi Class E compliant HiVis material and reflective tape. Add to any Class 2 or Class 3 top to make the entire outfit Class 3 compliant. Sizing Instructions: For the most accurate fit, take your measurements over the base layer of clothing you intend to wear with this RefrigiWear gear (such as thermal underwear, jeans or a sweatshirt) and refer to the size chart for this product.