The heart of the Helios´s extraordinary design and performance is Spherical Technology, which utilizes a ball-and-socket design powered by MIPS®, the market-leading brain protection system that can help to reduce rotational forces. Spherical Technology allows the helmet´s outer liner to rotate around the inner liner during a crash, and also allows Progressive Layering of the inner and outer liners to provide more comprehensive protection and performance. In addition to advanced head protection, the Helios´s 15 Wind Tunnel vents provide exceptional cooling power that´s enhanced by our patented Roc Loc 5 Air fit system and plush, antimicrobial XT2 padding for exceptional sweat absorption. It´s the ideal match for your road and gravel adventures.Specs:Mips: Mips spherical - essentially an invisible low-friction layer sandwiched within two layers of eps foam, the result is a reduction of rotational forces and the elimination of the plastic slip plane of the original mips design. Redirects impact energy by allowing the helmet´s exterior liner to rotate independently of the interior liner in an angled impact.Construction: Independent, in-mold liners with spherical ball-and-socket designPolycarbonate shellHardbody lower shellShell type: Polycarbonate shellSport: CyclingNumber of vents: 15Interior/liner type: Spherical technology, powered by mips®Ventilation type: 15 wind tunnel vents with internal channelingFit system: Roc loc 5 airImpact liner: type Two eps foam liners with progressive layeringProduct weight: 270g (size medium cpsc)Certification: U.s.: cpsc bicycle for ages 5+E.u.: ce en1078