Chill-Its 6710FR Fire Resistant Cooling Tie Bandana Triangle Hat, One Size Fits Most, Blue Modacrylic cotton blend fabric. Fabric meets ASTM F1506 performance requirements (ATPV rating of 7.1 cal/cm2); classified CAT1 per NFPA 70E. Meets ASTM F2302 for flame resistance. Soak in water 2 to 5 minutes to activate. Remains hydrated for up to four hours. Re-usable, just re-wet.