Big-Mountain brawn, designed for those who demand the highest level of performance, the MOD5 delivers the perfect balance of increased protection and weight savings for technical riding. Patented Safety System Low Friction Layer Founded In Science MIPS Adjustable Ventilation Fidlock Buckle: Seamless magnetic functionality lets you fasten your helmet with gloves on Removable Liner/Earpads Modular Brim System: Two interchangeable brims allow for seamless helmet and goggle integration, no matter the size or shape of your favorite goggle Brim/Goggle Ventilation: Allows hot air to flow unobstructed from the goggle through the brim ventilation for better anti-fog performance M - 55-59cm L - 59-61cm