Cooling solar hard hat. 30 DAY WARRANTY. Stay comfortable on the job with this innovative green cooling solar powered hard hat. The Kool Breeze Solar Hard Hat delivers powerful ventilation with a built-in fan and a high/low switch that lets you adjust the airflow. The solar powered hard hat fan works both indoors and out, making it great for any job site. With its integrated fan and thin solar panels, the hard hat remains light-weight so it won't slow you down or add any extra bulk to your gear.