Made with lightweight 4.1 ox 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. Our VEA brand is two-tone lime/black to help hide dirt and stains. In addition, the the 3M Scotchlite Reflective Material- 5510 Comfort Trim adds extra comfort and does not buckle or rub like sewn on reflective tape.