EVS R4 Karting Pro Race Collar is for karting only - not auto racing!!! EVS took their proven race collar technology and stepped it up to the next level. The new R4 Pro improves upon existing lightweight feel and incredible fit by incorporating the use of carbon fiber, hight impact injection grade bio-foam and an all new innovative air bladder shock absorption system. In addition, EVS improved the harnessing system by providing an all new bi-lateral torso strapping system. Minimizes risk of axial compression, hyperflexion, hyperextension and lateral hyperflexion.