7.5 oz - 88% Cotton/12% Nylon Milliken Amplitude. NFPA/FR 1975 Certified. Wrinkle, Shrink and Fade Resistant. Comfortable Self Adjusting Tunnel Waistband. Gusseted Crotch for Freedom of Movement. Double-Time Belt Loops. Extra Deep Front Pockets. YKK Nomex zippers, Nomex thread and Prym snaps.