Flame retardant, Anti-Static, ARC Long Johns (under garment). 210gsm 60/40 Modacrylic/ cotton with anti static. Inherently flame retardant fabric. FR properties will not diminish with repeated laundering. Soft comfortable fabric with contrast FR sewing thread. EN ISO 13688: 2013. EN 1149-3: 2008. EN 1149-5: 2015. EN ISO 11612: 2015 (A1 B1 C1). EN ISO 14116: 2015 (3/5H/40). IEC 61482-2-2009. EN 61482-1-2-2007 (Class 1 = 4 kA) - Box Arc testing. EN 61482 - 1 - 1 : 2009 (EBT50 = 5.9 cAL/cm2) Open Arc testing. Each garment is independently tested to both box and open ARC standards. Click ARC production is covered by article 11B certification.