Enhance air intake and ventilation through three opposite holes to prevent heat and moisture from being generated in the helmet.Safety lenses are firmly mounted,lenses are easily clamped,and the base is safe and firm.Remove and wash lining,easy to clean,soft touch,breathable and comfortable.Allow multiple washing,no shrinkage,no deformation,durability,easy care.Double D buckle+buckle design,convenient and safe,greatly improve the safety factor