I have the Tilley LT5B hat and bought this LTM5 Airflow to get a similar hat that would be cooler in very hot weather. The Tilley LTM5 Airflow is not nearly as nice a hat as their non-Airflow ones. The sides of the hat are not stiff enough to stay straight and so the hat looks like a boonie hat. Better to buy a cheap boonie hat and save $50 as the appearance will be the same.