Cycling cap for summer. Yay or nay?

I wear a Castelli summer cap because I really like to have a visor to shade my face and help keep the sun out of my eyes. Unfortunately they have discontinued it. It was the only cap I could find that had a hole for a ponytail. Seriously, why is it so hard to find caps with holes for ponytails? Helmets now have ponytail holes. Why can’t more caps??