Most hats have moisture-wicking sweatbands that deal with excess sweat during exercise. Some of them also have a breathable mesh back that helps keep you cool.
Another benefit of wearing a gym hat is that it can help regulate your body temperature, which is important during exercise. The right hat material can either retain heat and increase your body temperature, or it can wick away sweat to lower your body temperature.
The Gymshark gym hat is a perfect example of a quality workout hat. It has a breathable mesh back that improves ventilation and keeps your head cool. The hat is also made from a quick-drying fabric, so it will be easy to clean.
