SPARCO CIRCUIT II LF SEATCIRCUIT II LF SEAT 008133FNR The Circuit II LF is a wider version of the Circuit which is an ultra light competition seat specifically designed for circuit use. Made from aramadic fibers reinforced fiberglass, the Circuit II LF has an ultra light shell. The Circuit II LF includes integrated bolsters to protect the head and a unique seat design that helps separate the drivers leg. This seat can be used with a Hans device for even greater protection.