CarbonX undergarments are made of a single layer of 7.7 oz. interlock knit. The fabric has a TPP rating of 14.7 and an Arc rating ATPV 11 cal/cm2. CarbonX® fabrics are based on patented blends of high-performance fibers that will not ignite, burn, char, shrink or significantly decompose when exposed to intense flame, molten metal, arc flash or high heat. Even after intense exposure, CarbonX® maintains its integrity and continues to protect. These capabilities are why CarbonX® is the best non-flammable fabric on the market today. CarbonX® stands up to direct flame better than any material. Even after extended exposure CarbonX® will not ignite, char or crack which provides the protection wearers need during exposure to flame. CarbonX® provides an outstanding persistent protective barrier against dangerous metal splash – and an excellent supplement to standard personal protective equipment (PPE). In addition, aluminized CarbonX® jackets, spats and gloves offer a lighter, more comfortable, and more effective alternative to traditional aluminized clothing. Arc flashing can produce temperatures up to 35,000F in less than a second. This sudden, intense heat can ignite most flame-resistant clothing, melt clothing into skin, and cause serious second and third-degree burns. CarbonX® clothing provides the best possible protection against electrical arcing injuries because it distributes heat evenly and maintains its integrity – even under the extreme conditions caused by electrical arcing.