Phase 2 is a midweight patented FR blend of Modacrylic & FR Rayon. Warmer option for FR thermal. Great as a layered piece for added warmth. Extremely great feel next-to-skin and a generous cut for comfort. Our FR is inherent and built-in at the yarn level, meaning it won't wash out and provide no melt/no drip protection for the life of the garment. Acclimate® Dry moisture management and Ag47® anti-microbial/anti-odor will keep you comfortable and odor-free. Utilizing Clean Seam® flat-seaming to provide a comfortable seam next-to-skin helps reduce the risk of friction and irritation. Perfect under Nomex to add some breathability and wicking. Fabric: a Patented blend of Modacrylic & FR RayonWeight: 5.5 oz/sq. yd / 155 gramsLayer: Next-to-SkinSizing:  Men's Sizing/Fit. Fit: Regular/Relaxed Fit - Neither Snug Nor Loose With A Full Range Of Unrestricted MovementTemp Range: Cool to Mild temps/environmentsInherently FR At Yarn Level - FR Protection For Life Of GarmentASTM D6413 Standard - No Melt/No DripSuperior Acclimate® Dry Moisture ManagementAg47® Anti-Microbial ProtectionUPF UV Protection - 35+Clean Seam® Next-To-Skin Comfort, Durable, Breathable & Won’t Shrink.Tagless back label100% USA Made & Berry Comp