Not sure where you're located but you can try the website
https://www.hatsunlimited.com/ for summer style hats to keep the summer sun and heat off of your head.
I've bought from
https://www.hatsunlimited.com before and they've been great at shipping fast and have some great quality hats for summertime as well as any other time of the year.
Amazon and ebay can also have a wide variety of summer caps and hats for you.
Hope you have a great summer.