This hat is basically to wear at home to shield your head from EMF and light based attacks. The cap comes with grounding strap, 2 magnets and a rubber pad that blocks light and EMF. Cap has 4 layers of copper and nickel fabric, a layer of light blocking rubber fabric and is covered witih a protective polyester/cotton broadcloth. It has elastic but allso a tie to adjust it to your comfort of tightness. It is meant to not allow frequencies across the skin so it should touch your skin all the way around tight but not uncomfortable. The cap comes in black only or perhaps navy blue if that color is available.
The cap has s grounding tab which attaches to the any grounding material with the grounding strap. It should be touching unpainted matal or a magnet which will bleed off the frequencies coming towards your head. It comes with two removable magnets, a grounding strap and the rubber pad you can use or not.
Grounding is the key to stopping frequencies.