EVS R4 Pro Race Collar Evs took their race-proven collar technology and stepped it up to the next level. The R4 Pro Race Collar improves upon existing lightweight feel and incredible fit by incorporating the use of carbon fiber, high impact injection grade biofoam and an innovative air bladder shock absorption system. In addition, Evs improved the harnessing system by providing a bilateral torso strapping system. Features: Minimizes risk of axial compression, hyperflexion, hyperextension, and lateral hyperflexion. Easy front entry system. Soft rubberized edges for increased comfort. Adjustable sizing. Ultra lightweight and low profile. Adjustable rear strut. Rear axial load absorber tail. X-strap harness. 635 grams.