Sio-Safe Essential: 79% FR cotton + 20% PES + 1% AST, 350 g/m2, comfortable and breathable, soft and elastic. Good wicking properties. Non-allergenic and harmless to the skin. Reinforced seams for durability and longer life. High abrasion resistance. Closure with hidden push buttons under the flap. 1back pocket with flap and hidden press studs. 2 covered slant pockets. 1 shod pocket with hidden press studs. 1 ruler pocket. Guillotined waist, knee pockets. IEC 61482-2 : 2009 class 1- ATPV 15.2 cal/cm2, EN ISO 11612 : 2008 / A1 A2 B1 C1 E3 F1, EN ISO 11611 : 2007 / Class 1 - A1 A2, EN 1149-5 : 2008, EN 13034 : 2005 + A1 : 2009 Type 6, EN ISO 13688 : 2013.