Caterpillar Flame Resistant 6.5 oz Lightweight Work Shirt With Stretch Panels 100% Other Fibers Imported Machine Wash FR Certified to UL NFPA 2112, NFPA 70E, CAT 2, ATPV 8.9 6.5 oz. FR 70 percent cotton/18 percent tencel/12 percent nylon twill FR Side stretch panels- 32 percent nomex/Kevlar/29 percent tencel/28 percent protex C/6 percent polyester/5 percent spandex Moisture wicking, breathable, and flexible FR buttons, articulated elbows, drop tail hem