XGO offers a great line of Flame Retardant clothing for first or second layer. With a blend of Modacrylic and FR Rayon for quick drying and moisture wicking to keep you dry and flame resistance to keep you safe this is the shirt for your next day on the flight deck. Comes in all your favorite colors. Features:XGO 1F11KFlight Deck Strong CrewLightweight FR First or Second LayerWeight 4.8 oz.Patented blend of Modacrylic and FR RayonASTM D6413 StandardNo Melt/No DripSuperior Acclimate Dry Moisture-WickingIntense Quick DryingAg47 Anti-Microbial ProtectionRolled Shoulders and Clean Seam Next-To-Skin ComfortUnder Arm Gussets Increased MobilityExtra Length (Body)Durable, Breathable and Won’t Shrink100% USA Made and Berry Compliant