When your job requires exposure to dangerous arcs and flames, protect yourself with this men's flame-resistant jacket. It's made of lightweight, water-resistant fabric that gives you the warmth and durability of sandstone duck without the bulk. Stretch panels on the back, elbows, and sides let you maneuver into tight spots. - Quick Duck®: 8.5-ounce, 88% cotton/12% nylon; 20% lighter but just as warm as heavier outerwear - Mighty Back™ bi-swing between shoulders for instant recovery - Flex Elbow™ for less restriction: it has an inside stretch panel and articulated seams on the outside - Sleeve-riding-up prevention in the form of an under arm Freedom Gusset™ and stretch side panels - Vislon® front zipper with Nomex® FR zipper tape plus inside protective flap - Meets the performance requirements of NFPA 70E and is UL® Classified to NFPA 2112