In the wild, plants and animals have adopted various mechanisms for dealing with high temperatures: leaves curl, hippos wallow, dogs pant. Humans, however, are left with two options: take a long nap beside an oscillating fan... or gear up and tough it out.
Hey, we can't all live on an ice cap, and you've adapted to your environment... for the most part. Salomon's XA cap is lightweight and breathable for hot-weather trail runs and hikes, using ClimaWind Teflon Taffeta fabric to keep bright light and sweat out of your eyes. Vents in the crown allow cool air in and hot air out. An integrated sweat band soaks up moisture and allows it to evaporate, helping you keep cool. It's the next best thing to a built-in swamp cooling system, but far more logistically sound.