8.5 oz., FR canvas: 88% cotton/12% FR nylon. FR sherpa lining. Two large, sherpa lined front pockets. Two inside pockets. Carhartt FR vest features a drop tail for added coverage. Back length: Large Regular: 27.75″; Large Tall: 29.25″. Carhartt FR label and HRC 4 label sewn on left pocket. Carhartt flame resistant mockneck vest meets the performance requirements of NFPA 70E.-Arc Rating ATPV 43.0 calories/cm 2 -Hazard Risk Category (HRC): 4