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T.2.8.1 A Head Restraint must be provided to limit the rearward motion of the driver’s head.
T.2.8.2 The Head Restraint must be vertical or near vertical in side view.
T.2.8.3 All material and structure of the Head Restraint must be inside the Rollover Protection Envelope F.1.12
T.2.8.4 The Head Restraint, attachment and mounting must be strong enough to withstand a force of:
a. 900 N applied in a rearward direction
b. 300 N applied in a lateral or vertical direction
T.2.8.5 For all drivers, the Head Restraint must be located and adjusted so that:
a. The Head Restraint is no more than 25 mm away from the back of the driver’s helmet,
with the driver in their normal driving position.
b. The contact point of the back of the driver’s helmet on the Head Restraint is no less than 50 mm from any edge of the Head Restraint.
Approximately 100 mm of longitudinal adjustment should accommodate range of specified drivers. Several Head Restraints with different thicknesses may be used
T.2.8.6 The Head Restraint padding must:
a. Be an energy absorbing material that meets SFI Spec 45.2, or is listed in the FIA Technical List No. 17 as a “Type B Material for single seater cars”: CONFOR M foam CF-42 (pink) or CF-42M (pink). CF-42AC (pink) is acceptable.
b. Have a minimum thickness of 38 mm
c. Have a minimum width of 15 cm
d. Meet one of the following:
minimum area of 235 cm2 AND minimum total height adjustment of 17.5 cm
minimum height of 28 cm
e. Be covered with a thin, flexible material that contains a ~20 mm diameter inspection hole in a surface other than the front surface