This is ANSI Class 2 Compliant. Made with lightweight 4.1 oz Birdseye Knit Polyester. It feels butter soft on the inside, yet is work-wear durable. It features a rib knit collar and 3-buttoned placket for a professional appearance. Our High Visibility Shirt wicks away moisture 3 times faster than cotton. In addition, the 3M™ Scotchlite™ Reflective Material – 5510 Comfort Trim adds extra comfort and does not buckle or rub like sewn on reflective tape.