EVS F1 Roost Guard Adult (White) Size L/XL Features: The F1’s lightweight, form fitting design provides optimal protection, functionality, and comfort designed to be worn over or under the jersey. This product is strategically designed to fit all EVS race collars and most neck braces. Integrated loop straps ensure that any EVS race collar stays in place during use. Click-Tec front closure system ensures adjustability and secure fit Plush bio-foam liner Size: S/M and L/XL CE Certified S/M (Youth) - UNDER 125 LBS. / UNDER 5' L/XL (Adult)  - 125 LBS. / 5'  Key Features   Modularity A modular design allows for different configurations depending on the user’s preferences.   Flow Vents The grid style air vents provide additional air circulation to help regulate your core temperature.   Impact Shield An exterior of a high-impact tested polymer provides optimum protection against debris and collisions.