Made with 7.5 vinyl coated polyester mesh for high strength, yet light weight. It is made out of high tensile strength flexible knit which makes it tear resistant, and is 1000 denier and has good flexibility. Its high visibility florescent red/orange gives it excellent daytime visibility and 2 reflexite lime/yellow reflective stripes 13⁄8", full length front and back gives it excellent nighttime visibility. 3" velcro closure is extra length for better closure & its 3⁄4" x 81⁄4 side elastics are made for extra large capacity, to accommodate workers with larger frames. It is U.V. resistant and does not break down under sunlight.