The Oakley MOD1 is a super lightweight, low-profile, skate inspired helmet made for snow. Featuring a simple design with a customisable fit, the MOD1 delivers comfort, style, and protection, without blowing out the budget. BOA 360 Fit System: This fully adjustable design is engineered to help deliver the perfect fit. Fixed Ventilation: Allows hot air to escape from the helmet, regulating temperature and keeping you comfortable. Fidlock Buckle: The Fidlock buckle is a secure, magnet guided system that allows you to easily fasten or unfasten the lock, even with gloves on. Removable Liner/Earpads: Machine washable, breathable, and compatible with a goggle strap underneath the helmet. Brim/Goggle Ventilation: Ventilation in the brim of the helmet allows hot air to flow unobstructed from the goggle, greatly reducing the potential for fog. SIZE CHART Size Small Medium Large X-Large Head Circumference (cm) 51 - 55 55 - 59 59 - 61 61 - 63