Stretchy anti-radiation Silver-coated nylon skull cap with ear flaps is lightweight and breathes nicely. Comfortable enough to wear year-round while sleeping, thin enough to be worn under a conventional hat or all on its own. Stretchy, so it conforms to your head.
Microwave Shielding Effect: >35dB at 1-10 GHz. Surface resistivity: <0.5 Ohm/sq. Shielding performance decreases over time. Sound quality is not affected. Ear flaps can be tucked under to make a beanie shape if you prefer. Ok, it's not a Royal wedding "Fascinator" but if you prefer comfortable, practical, effective RF shielding over fashion, this is the silver-threaded EMF blocking hat for you.