Lightweight Flame Resistant Thermal Pant - FR Phase 1 FR Phase 1 is one of the lightest most durable FR fabrics on the market. FR Phase 1 is a lightweight patented blend of Modacrylic FR Rayon, inherent at the yarn level, providing FR protection for the life of the garment. Superior Acclimate Dry Moisture Management wicks sweat away from the body and dries rapidly. AG47 Silver Anti-Microbial fights and eliminates harmful bacteria from your sweat leaving you odor free. Clean Seam provides unparalleled next-to-skin comfort. Gone are the days of uncomfortable FR base layers. Build your base with the best FR base layers on the market and worry less about your base layers and more about the mission at hand! Features Acclimate Dry Moisture Management (Superior Wicking / Drying) Ag47 Anti-Microbial / Anti-Odor Protection Designed With Appropriate Rise Depth And Height - Ensuring Complete Coverage And Comfort In Any Activity Clean Seam Next-To-Skin Comfort Superior Hand/Feel UPF UV Protection - 25+ Durable, Breathable Won’t Shrink Large (36-38 W) X-Large (40-42W)