This Brown Duck Insulated Bib Overall Work Uniform provides superior HRC4 protection with an Arc Rating ATPV of 56.6 calories/cm2. The flame-resistant 11.5 oz. duck 88% cotton/12% nylon outershell is water repellent, while the flame-resistant 12 oz. two-layer quilted Modacrylic insulation provides superior warmth. It features a NOMEX taped brass zipper fly front, covered with one large front bib pocket with a pencil stall, two set-in front swing pockets, a watch pocket, two large hip pockets, two-piece ruler pockets, tool pocket, tool loop, and hammer loop. Reinforced double knees and full NOMEX taped ankle to hip brass zippers with a concealed snap closure provide extra durability. Inside zipper guards on all zippers and elasticized shoulder straps with non-conductive adjustable hardware ensure a secure fit.