C50 Off-Road Helmet. Advanced Polycarbonate Compound (APC) shell. "ACS" Advanced Channeling Ventilation System. Optimized peak visor has been wind tunnel tested and fine-tuned using advanced CFD (Computational Fluid Dynamics) programs. Tool-less Peak Visor - Fasten and Remove with hands. BCS (Bespoke Contour System) fitting. Moisture-wicking and quick drying interior. Interior includes grooves to accommodate eyeglasses.