EMF-Shielding Faraday Baseball Cap

What types of EMF does the hat help shield against?
Where is the EMF-protective material located in the hat?
Can I wear the hat every day?
Can I wear it while exercising or outside in hot weather?
Does the hat fit like a standard baseball cap?
Why would I want to reduce EMF exposure around my head?
What is the Faraday lining made from?