Fabric: 311 gsm Cotton Drill. Patron Saint F/R Pants with heavy duty nylon zipper and pleat front. Complies with international F/R standards: BS EN ISO 11612:2008 Protective Clothing to protect against heat and flame -Clause 6.3 ARC Thermal Protection Value - ATP Rating: 14 cal/Cm2 (Calories per cubic cm) Comply with ASTM F1959/F1959M-12 Standard. HRC:2 Comply with the Oeko-tex100 Certificate, safe to wear against the skin. 50 domestic washes @60 degrees celcius