FR Phase 3 is a super midweight stretch patented blend of Modacrylic, FR Rayon & Spandex, 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.