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14 ButlerBuilt’s head support system is the same it sells to the Sprint Cup teams and actually meets an SFI certification separate from the seat. The foam on the right side is built from three separate layers. The outermost layer is for comfort and allows the driver to rest his helmet against the support without transmitting vibrations from the car to the driver’s head. The next two layers are progressively stronger and designed to cushion the blow to a driver’s head in a side impact while also limiting movement.