Step 1: Find a Helmet
You can find a bike helmet almost anywhere like a Walmart or local convenient store.
Step 2: The Power System
Get your 2 9 volt batteries and positive and Negitive wires plus the fan and solder the wires to the batteries and fan and solar panels.
Step 3: The Switch
Of course you have to add your switch to the circuits so solder that together.
Step 4: Finished Cooling System!
This is what it should look like it only takes about 2 hours but you can have a cool ride in the sun on your bike!
Step 5: Also For...
This works for safety helmets too when working on the job in the hot blazing sun every day!