Giro synthe helmet the all new synthe combines the performance of an aero helmet with the cooling power of a well vented helmetwith 19 vents and internal channeling your head will be kept cool even in the warmest of conditionsgiros roc loc air fit system enhances comfort and stability the unique design that suspends the helmet slightly above the head will also help with coolingthe micro adjustments can be made with one hand allowing you to custom fit the helmet whilst ridingthe x static paddi