Designed to handle the toughest jobs, the Ariat FR M4 Low Rise Workhorse Bootcut Pants have the organization and the durability you need to excel. Certifications:. CAT 2. NFPA 2112. NFPA 70E. ATPV 12.7 cal/cm2 Cotton-nylon blend with flame-resistant properties. Low-rise bootcut pants. Belt-loop waist with zipper fly. Two slip hand pockets, Hidden phone pocket, utility, and multi-tool pockets at back. 88% cotton, 12% nylon. Machine wash, tumble dry. Color: natural