Holley EFI Map Sensor 1 Bar Helmet Blower Rocker Switch Jackets are constructed of a EQ TCC294A Jackets are constructed of a single layer of Pyrovatex flame retardant cotton material which offers a high level of heat and flame protection along with durability and comfort to meet the requirements of the SFI 3 NecksGen feels that they have achieved the ultimate goal of making the safest Builders like Dave Lane who used Holley EFI to power the 2013 Goodguys Hot Rod of the Year and tuners like Steve Morris who use it to build some of the baddest forced induction beasts on the planet The world's best street machine builders and tuners are making the switch to Holley EFI