5.5 oz Modacrylic blend fabric proactively regulates body temperature, reduces perspiration by as much as 34%, maintains a comfortable work environment, keeps the wearer cooler on hot days, warmer on cool days, and limits overheating. Anti-microbial properties to resist odors. Arc rating: 4 cal/cm², CAT 1. Complies with OSHA 1910.269. Compliant to ASTM F1506, NFPA 70E, and CSA Z462 for Arc Flash (Canada). Made in USA.