BOA® 360 Fit System: Designed for a precise fit with a design that allows for fine adjustments. - Fixed Ventilation: Allows heat to escape from the top of the helmet. - MIPS® Integrated (Optional): The MIPS® Brain Protection System is a low-friction layer integrated into the helmet, designed to reduce rotational motion transferred to the brain during an impact. - FIDLOCK® Buckle: Seamless magnetic functionality allows you to fasten the helmet even with gloves on. - Removable Liner & Ear Pads: Easy to wash in a washing machine, adapts to a wide range of weather conditions, and easily stores goggle straps under the helmet. - Brim/Goggle Ventilation: Prevents fogging by venting hot air from the goggles through the brim ventilation. - Adult Size: L (59-61cm) I just bought it, but I've only worn it once. It doesn't fit my head shape, so I'm selling it. It's a popular item that's sold out online.