The Giro Insurgent Spherical MIPS Full Face Helmet delivers the protection and comfort that the world's top gravity riders require. The unique ball-and-socket design of Spherical Technology utilizes two separate liners to help manage impact forces. The material and density of the inner and outer liners can be optimized with Progressive Layering to help manage a broad range of impact forces: the Insurgent features an outer EPS layer (to address high-speed impacts) and an inner EPP layer (with rebound characteristics designed to handle slower speed falls.) When you combine the benefits of Progressive Layering with the market-leading MIPS Brain Protection System, which can help redirect rotational energy away from the brain, you get more comprehensive protection.