The Giro Hex is very good. I rode in July/August in N Florida and N Georgia with it. The scoops work. It also provides better (lower) protection around the sides/back of the head.
I've replaced it with the new Xen redesign. I wore the Hex innerds/suspension out. The Xen is the more expensive cousin or step-up from the Hex. It cools well, but not as well as the hex at lower speed. It too provides better protection.
The Xen has the best suspension strap system I've ever seen. The staps don't hit the sides of the head as much as typical helmets.
They are primarily mountain bike helmets. But the visors are removable. Both are more round than normal which supposedly is somewhat safer than the pointy shapes.
Al
Last edited by alcanoe; 08-29-10 at 05:36 PM.