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, Available in Sizes: S/M and L/XL