The Hybrid S Head Restraint is FIA and SFI approved (when worn with a multi-point harness system) and is tested and shown to be compatible with 3-point harnesses used by Car Club enthusiasts and High Performance Driving Experiences. This allows Driving Instructors, Auto Manufacturing Test Engineers, and other cars with 3-point harnesses to have added protection.  We are pleased to offer protection to this sector of the market, however, Simpson’s top concern is your safety.  While on a racetrack for the BEST protection we suggest a Full-Containment Cockpit System that includes a, Full Containment Seat, Snell rated Helmet, FIA or SFI approved Head Restraint, and 7 point seatbelt harness system.
 
FIA and SFI Approved with 5, 6 and 7 multi-point harness systems
FMVSS Tested for use with 3-point OEM belt system
High quality carbon fiber construction
Low profile. No high back to hook on the bars on exit
Multiple load paths to dissipate head loads
Buckle attachment in front. No bulky straps underneath
Installation manual
NOTE: Helmets anchors sold separately
 
To Install a Hybrid S into a 3 point seat belt system, the SAS, Seat Belt Anchoring System, are not used.  (The SAS straps anchor loops hook into the seat belt buckle in a 5, 6 or 7 point set of seat belts in a Race Car.)  
 
Just as in a Race Seat installation, the occupant puts on the Hybrid S and gets into the seat.  Follow the instructions on fitting the device to the wearer. 
Hook up the 3 point belt and sit in your normal driving position.  
Have a helper, apply gentle pressure to the shoulder pads on the top of the device.  This will keep the device stable during the tether adjustment procedure.  The device should be in a comfortable position behind the driver’s back, against the seat cushion.  If the device is uncomfortable in the seat, a device pad can purchased that will attach to the back of the seat and provide a slot for the device to sit.  This is not normally needed for the use in a soft back seat such a