FARADAY CAPS (www.FaradayCaps.com) is very simply EMF shielding for the head.  Head covering (caps, hats, etc) are critical to protecting the brain and central nervous system headquarters from harmful radiation, cell tower, cell phone, EMF, fluorescent light emissions, and a host of very harmful emissions.   Our modern environment bombards our systems daily with massive amounts of Electromagnetic Frequencies.  Many are harmful.