Sparco Circuit II QRTCIRCUIT II QRT The Circuit II QRT is a wider version of the Circuit QRT which was designed to provide addtional head and neck protection. Made from aramadic fiber reinforced fiberglass with all new QRT Technology, the Circuit II QRT features a wider shell to accommodate a larger driver. The Circuit II QRT includes integrated head bolsters to protect the head and deep side bolster for maximum lateral containment. This seat can be used with an FHR