The Ariat M4 Relaxed Duralight Ripstop Boot Cut FR Pants are 6.1 oz. inherently FR ripstop work pants rated 9.8 cal/cm2 (CAT 2), built for workers who need lightweight lower-body arc protection, moisture control, and mobility in hot, high-movement field wear. They meet NFPA 70E and ASTM F1506 performance requirements, are tested to ASTM D6413, and Ariat lists them as UL classified to NFPA 2112. The fabric package is specific to this style. Ariat uses a 54% meta-aramid, 40% modacrylic, 5% para-aramid, 1% antistatic inherent ripstop in a 6.1 oz. construction, then pairs it with quick-drying, ultra-breathable performance and Moisture Movement Technology to help wick sweat away from the skin. Because the flame resistance is built into the fiber itself, the protection will not wash out with repeated laundering. The fit and build make this a true work pant, not a stripped-down lightweight option. The M4 has a relaxed through the waist, hip, and thigh with a mid rise and a classic 19-inch boot cut leg opening that stacks over work boots. The pants also include articulated knees, strategically reinforced belt loops, a no-rub comfort inseam that lays flat in high-movement areas, heavy-duty zipper and hardware, extra-deep front pockets, and utility pockets. Those details matter for kneeling, climbing, bending, and daily tool carry. Ariat makes it in Mexico with fabric from the USA. For care, wash according to the garment label, use warm water or the hottest label-allowed setting when heavily soiled, line dry or tumble dry low to limit shrinkage, and avoid bleach, fabric softener, or starch. Properly cared for, this garment maintains its flame resistant properties for the useful life of the garment.