Designed to fit over hard hats in cold weather applications. Features: Modacrylic blend material.Fits snugly.Keeps head and ears protected from wind and cool conditions.Meets ASTM F1506 / NFPA 70E.PPE 3 Specs: FR Knit Winter Watch Cap- Flame Resistant Arc Rated Modacrylic- Arc Rating 33 Cal/cm2- Meets ASTM F1506- NFPA 70E- Black Case Quantity: 144 Case Length: 41 Case Width: 44 Case Height: 41