Ventilation is important in a helmet in order to keep your head cool during long bike rides.

In the article, he asks of the readers to "keep the head cool and the relations warm".

"You have to have your head cool, be aggressive, and don't wait for mistakes from the other one."

Augustus took off his hat for a moment to let his head cool.

Let him go home and keep his head cool.

James vowed to keep his head cool and his ramrod limp if it was the last thing he did.

The toque was designed to keep hair neatly tucked up and the head cool.

A traditional way to keep the head cool when cycling in hot conditions was to put a cabbage leaf under the casquette.

But the point is this, don't you know, you can fight better with your head cool and your plans well laid beforehand.

He could kill a hundred different ways, handle himself in any kind of battle, keep his head cool when the goddamned world was on fire.