The Rudy Project Windmax is a relatively expensive road helmet at $299, but has all the refinements you'd expect at that level. 22 vents keep things very airy, and if it fits you, it's a comfortable lid. For those who race in aero helmets, the price will be hard to justify. But those who train AND race in standard road helmets would do well to consider the Windmax.
This chin pad can keep the helmet a bit more comfortable, but I removed mine for riding.