In 1935, when the First Cycling Tour of Spain was held, the club wore iron bikes and cycling caps! And that we can not consent to cease to exist, yes, under the helmet if you are going to roll.
Our damn caps protect you from the sun and also from the cold because they are made with Coolmax® fabric that apart from being light so as not to crush your neurons, it is super breathable. The visor is very flexible and waterproof.
In short, it is a very comfortable cap like this while you climb a port you can think a little without suffocating and also, you will wear it even if you do not go by bike!