75% cotton, 24% polyester, 1% antistatic, twill, flame resistant antistatic, 10,3 oz; Back pockets with flap, hidden with metal buttons; Leg pocket with bellow, flap and pen pocket, extra pocket and telephone pocket; Angled front pockets; Outer knee protection pocket; Reinforced ruler pocket with knife holder and pen pocket; 50 mm wide flame retardant reflective tape; External certification labels