Bulwark® has a new layering option that makes you compliant without compromising your comfort. The MPU2KH is 100% FR cotton that features side seam
Fabric EXCEL FR™ Flame-resistant, 4.5 oz., 100% cottongussets
   * Full sideseam gusset
   * Self fabric collar
   * Hemmed sleeves
   * Tagless brand label and warning label
Protection: Arc Rating ATPV 4.0 calories/cm2
Care: Home Wash

Ammonia Cure and Heat Cure
Cotton or Cotton blend fabrics are made flame-resistant by application of a flame retardant. This finish can be either a phosphonium salt precondensate polymerized with gaseous ammonia (THPOH-NH3), or a heat-cured dialkylphosphonamide. These processes bind the flame retardant to cotton fiber FR for durability. Either process has little effect on fabric hand and performance.