Activated polymers bring cooling relief along with FR protection. Modacrylic cotton blend fabric. Soak in water 2-5 minutes to activate; remains hydrated for up to 4 hours and is re-usable. Fabric meets ASTM F1506 performance requirements (ATPV rating of 7.1 cal/cm²); classified CAT1 per NFPA 70E. Meets ASTM F2302 for flame resistance. (Ergodyne)