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 Rayon Weight: 5.5 oz/sq. yd / 155 grams Layer: Next-to-Skin Sizing: Men's Sizing/Fit. Fit: Regular/Relaxed Fit - Neither Snug Nor Loose With A Full Range Of Unrestricted Movement Temp Range: Cool to Mild temps/environments Inherently FR At Yarn Level - FR Protection For Life Of Garment ASTM D6413 Standard - No Melt/No Drip Superior Acclimate Dry Moisture Management Ag47 Anti-Microbial Protection UPF UV Protection - 35+ Clean Seam Next-To-Skin Comfort, Durable, Breathable Won?t Shrink. Tagless back label 100% USA Made Berry Comp