With a TPP rating of ~37.4, CarbonKnight hoods have the highest TPP rating in the market - that is 87% higher than the NFPA requirement of 20! Manufactured with a double layer of black thermal knit material, CarbonKnight hoods are wider than the competition, which allows for superior air circulation. CarbonKnight is a tri-blend composition with added Kevlar for superior strength and durability. •Meets 18" NFPA Minimum requirement