Having to put on a helmet and work during summer outside is not a lot of fun. With the Tajima Seiryo Helmet Cooling Fan, you are going to have an easier time staying cool. It straps around your helmet and at the base of your skull to keep you comfortable. It comes with a silicone funnel connected to a 3-speed fan.
This fan dries off sweat off your head and keeps it cool. It can operate for 8 hours on full power.