Shade hat with a solar powered fan : r/DidntKnowIWantedThat

This Solar Powered Fan Hat Keeps Your Noggin Cool While Working Out In The Sun

Hard hat with a solar fan attached. Only works when you're facing into direct sunlight : r/CrappyDesign

Poweraid® 1.1W SOLSOL™ Collection The Solar Hat that Charges Special Note: Not Currently Available for iPhone 7 or IOS10 Charges Android

Poweraid® SOLSOL™ The Solar Hat that Charges

Solar Powered Hard Hat Fan Prototype : r/diyelectronics

Man builds a portable solar hat fan to cool himself during the hot sunny day : r/redneckengineering

Man builds a portable solar hat fan to cool himself during the hot sunny day : r/nealstephenson

Drip going into Lightfall. Big fan of the hat/helmet option here : r /DestinyFashion

Kool Breeze Solar Hats

Solar Fan Hat, Hat with Fan Built in Solar

Gardener with Band for Men Solar Hat - Sun Hat with Fan, Sun Hat with Solar Panel and Built-in Fan, One Size : Sports & Outdoors