FR M4 Low Rise Stretch Duralight Workhorse Stackable Straight Leg Jean AriatÂ FR Duralight Stretch Denim is more breathable, faster drying, and moisture wicking like never before. It keeps you dry, cool, comfortable, and moving freely in even the hottest working environments. Our workhorse features a straight leg and low rise. CAT 2 ATPV 14 cal/cm2 NFPA 70E NFPA 2112 Moisture Movement Technologyâ„ keeps you drier Elastic fibers woven into fabric for maximum flex Crafted with fabric made in the USA Lightweight inherent/cotton blend 11 oz stretch FR denim Moisture wicking Quick drying Ultra breathable Utility and phone pockets 69% cotton, 30% modacrylic, 1% spandex