This is ANSI Class 2 Compliant. Made with lightweight 4.1oz Birdseye Knit Polyester. It feels butter soft on the inside, yet is work-wear durable. The performance fabric wicks away moisture 3 times faster than cotton and minimizes odor. In addition, the 3M™ Scotchlite™ Reflective Material – 5510 Comfort Trim adds extra comfort and does not buckle or rub like sewn on reflective tape.