100% Cotton. Fabric: Bizweld. Design: Contrast Detail. 330gsm. Fabric Technology: Flame Resistant, Protection Against Radiant Heat, Splash Proof, Welding Protection. Pockets: Concealed, Mobile Phone, Knee Pad Pockets, Ruler Pocket, 2 Chest Pockets, Flap Closure, Stud Fastening, 2 Side Pockets. Radio Loop, Reflective Tape. Conforms to Safety Standard: ASTM F1959/F1959M-12 ATPV 11.2 CAL/CM2 (HAF = 80.4%), CE Certified, CE-CAT III, EN ISO 11611 Class 1 A1+A2, EN ISO 11612 A1+A2, B1, C1, E2, F1, IEC 61482-2 IEC 61482-1-1 Elim 8.3 CAL/CM², UKCA. Cuff: Adjustable, Stud. Fastening: Concealed, Pull-On, Stud. Waistline: Part Elasticated. Sun Rating: UPF 40+.