Quick Duck®: 8.5-ounce, 88% cotton/12% nylon; 20% lighter but as warm as heavier outerwear. Mighty Back™ bi-swing between shoulders for instant recovery. Flex Elbow™ for less restriction; inside stretch panel and articulated seams on the outside. Sleeve-riding-up prevention through 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.