Head and Neck Support Hans IV 20 FIA Approved Size L - O-SD04. L - Designed to meet the needs of professional and novice drivers alike, the HANS® IV represents a quantum leap in head and neck restraint technology. Building on the success of its predecessors, Stilo now offers a HANS IV system that introduces a lightweight composite design, losing almost 70 grams compared to the HANS III . Its integrated foam system guarantees a secure fit and eliminates the risk of the harness slipping, improving comfort and safety in the heat of action. Available in three sizes (Small, Medium and Large), the new design allows every driver to benefit from optimum protection and fit. Features: Lightweight construction: Composite materials reduce weight by 10% compared to previous models. Integrated pads: Custom-molded to lock securely in place, eliminating the problem of foam shifting during use. Improved belt retention: Improved design to prevent harness slippage under stress Approval: FIA 8858-2010 Angle of inclination: 20 Size corresponds to neck width: S - 35 to 40cm neck width M - from 40 to 45cm L - from 45 to 50cm The inclination is determined by the application: 20° the most common, used in closed vehicles 30° used for semi-recumbent positions in single-seaters or sport prototypes 10° very upright seat position 40° very reclined seat position Size: L