EVS Revo 4 Under Armour Adult (Black) The Revo 4 offers chest roost deflection in a lightweight, low profile, under-the-jersey design. The new protective chest plate provides enhanced ventilation for 2019. Molded cross-link bio-foam interior serves as a shock absorbing barrier Molded polycarbonate front plate provides impact, abrasion and puncture protection Fully adjustable fit to provide protection for riders of all sizes Neck brace compatible design New chest plate provides maximum airflow Key Features     Flow Vents Exterior venting provides additional air circulation.     Race Collar Compatible This product is strategically designed to fit all EVS race collars and most neck braces. Integrated loop straps ensures any EVS race collar stays in place during use.     Impact Shield An exterior of high-impact tested polymer provides optimum protection against debris and collisions. Sizing Chart View our complete size guide here.