The FX1 racing seat features composite fiberglass technology. The FX1 racing seat comes in three different sizes, the FX1 Pro, FX1, and FX1 Wide. Designed with an emphasis on comfort, this seat is one of the most comfortable race seats you will ever sit in. Most shell seats are side mount only, which means you have to side mount the seat and bolt it directly to the floor, eliminating the ability to slide forward and back. With the FX1, in addition to side mounting, you can still bottom mount the seat to Corbeau brackets and sliders. Please note, side mounts will not work with Corbeau bottom mount slider brackets.