FIA 8858-2010 approved Post Anchors / Tether Kit - Medium. The Hybrid Sport is a great head restraint device for those racing on a budget. The Hybrid Sport with its lightweight design and DuPont carbon/polymer construction provides maximum comfort and maneuverability with superior strength. Hybrids come race ready. The trusted low profile design disappears into the seat when worn and allows for easy in and out of the race car, eliminating the danger of becoming caught in other gear. The protection stays with the racer during multiple impact, flips and rolls.