WorkFlex functionality: Lightweight, durable, waterproof and wind resistant. 100% polyester knit fabric with a PU (polyurethane) coating. Meets ANSI Class E, Level 2 visibility standards. Stretchable 3M Scotchlite reflective material #8710. Stretchable fabric improves range of motion. Heat-sealed seams; major seams are also sewn. Elastic waistband with draw cord and barrel-lock adjusters. Inside knee-pad pockets with hook-and-loop closures. Reinforced double-knees and seat. Snap-adjustable leg openings.