Not to be confused with inferior quality boots offered by others. EMPI's stock style boots are manufactured in our molds, with high quality neoprene to give you the best boot available. *Solid type is a favorite of racers and offers excellent flexibility with no chance of seam problems. Split types were designed for ease of installation and have become the most popular choice for everyday use. Both styles include all necessary hardware. *Note: Solid boot requires the removal of bearing housings from axle tubes.