100% Cotton. Fabric: Bizweld. Design: Plain. 330gsm. Fastening: Button, Zip Fly. Fabric Technology: Flame Resistant. Belt Loops, Double Stitched Seams. Pockets: Ruler Pocket, 2 Side Pockets. Waistline: Part Elasticated. Conforms to Safety Standard: ASTM F1959/F1959M-12 ATPV=11.2CAL/CM2, EN ISO 11611 Class 1 A1+A2, EN ISO 11612 A1+A2, B2, C1, E2, F1, NFPA 70E. Sustainability: Oeko-Tex Standard 100 Certified, REACH, Sedex, WRAP Certified. Sun Rating: UPF 50+. Ref: UTPC7442