When it comes to choosing a new road bike helmet, there will be multiple factors that you need to balance to choose the right one for you. Safety will be your primary concern, but price, aerodynamics, weight, ventilation and of course style will come into play too.
Naturally, these factors play off against each other. Generally speaking, an aerodynamic helmet is considered less well ventilated and heavier, whereas a better-vented helmet is lighter but slower. Pick one that does all things well, and you're going to need deep pockets to pay for it.
