The SCOTT Vivo Plus is the ideal helmet for trail riders of all levels. It's lightweight and well-ventilated to help you feel confident and secure on any trail ahead. With its neutral look, this is a helmet that suits any riding style. Add the security of an integrated MIPS protection system, extended coverage, optimized geometry, and Scott's superior MRAS 3 fit system, and you can feel confident no matter where you go. MIPS Protection System MRAS 3 (Micro Rotary Adjustment System 3) Fit System Optimized ventilation to keep you cool Weight: 11.29 oz (Medium) Extended coverage Adjustable visor Shell construction: In-mold technology, polycarbonate microshell Size Chart: Small: 51cm - 55cm / 20" - 21.75" M: 55cm - 59cm / 21.75" - 23.25" L: 59cm - 61cm / 23.25" - 24"