Ideal for daily wear use and under arc flash suits and coveralls. Provides next to skin comfort and breathability. Features: Arc Rating: ATPV 12.1 calories/cm² HRC2.86% Cotton/12% High Tenacity Nylon/ 2% Spandex.Single Layer 6.5oz.Meets U.S. NFPA 70E, ASTM F1506.One size fits most Specs: ARC/FR Ultrasoft 6.5oz. Rib Knit Single Layer Balaclava- ASTM F1506- ATPV 12.1 HRC 2- Navy Applications: Electrical Contractors Utility Work Case Quantity: 50 Case Length: 24 Case Width: 24 Case Height: 12