OWN YOUR MISSION with DRIFIRE FR Control Hi-Vis WorkshirtDRIFIRE's FR Control Hi-Vis Workshirt is built to respond in both hot and cold temperatures. This flame resistant base layer offers the most advanced fabric technology that actively responds to fluctuating conditions and assists in regulating to your body temperature, reduces perspiration to keep you comfortable throughout the work day. Inherently flame resistant:The FR technology is a core feature of DRIFIRE products, this means the FR protection will not wash/wear out over time. Temperature Regulating Comfort:This Hi-Vis tee shirt proactively works to regulate skin temperature under your FR clothing, which makes it an excellent FR base layer choice for staying warm and protected in cold environments. The fluorescent yellow color keeps you visible in addition to the 3M™ Scotchlite™ FR silver reflected which is segmented for breathability and increased comfort. The 5.5 oz. Modacrylic Blend offers more stretch for a customized fit and the tagless shirt collar means no irritation. Moisture wicking & breathable fabric offers odor control protection and is Made in the USA.Stay Compliant:ANSI/ISEA 107CAT 1Arc Rating 4 cal/cm²NFPA 70E-2015CSA Z462ASTM F1506OSHA 1910.269HRC 1