This fire-resistant tee shirt is made of 7.8 oz Front Line Fabrics Rib-Knit-Inherent fire-protection for the life of the garment. Features of this product include breathability, moisture management tech, and fire resistant Nomex thread. This product maintains appearance after washing, with long-term durability and minimal pilling. Available in sizes XS – L. Certifications include an Arc Rating of ATPV 13 calories/cm2, HRC Category 1, NFPA 2112, and IEC 61482-1-1 Method B certified. Compliance Meets NFPA 2112 Standard on Flame-Resistant Clothing for Protection of Industrial Personnel Against Short-Duration Thermal Exposure from Fire, NFPA 70E Standard for Electrical Safety in the Workplace, ASTM F2621 Standard Practice for Determining Response Characteristics and Design Integrity of Arc-Rated Finished Products in an Electric Arc Exposure, and UL certified.