This is ANSI Class 3 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 3x faster than cotton and minimizes odor. Our High Visibility Shirt is compliant to ANSI/ISEA Class III for increased conspicuity. In addition, this shirt is available in Tall, sizes L-6X and features ANSI/ISEA 107-2020 Reflective Material durable through 50 home washes.