Style: Lightweight low-profile design features a Polycarbonate shell with proprietary Zipmold foam Light Weight & Ventilated: 7 vents allow maximum ventilation for warm weather riding Visor: Includes patented Flip Visor and moisture control liner Comfort & Adjustability: Velcro adjustable fit system. The Nino and Nina models from Bern have XS/S (48-51.5 cm) and S/M (51.5-54.5 cm) sizes. Please measure carefully to ensure proper sizing and safety.