>>>As the whole answer is tinged with sarcasm, ..
>>
>>Me? Sarcastic?
>>
>>I wear: http://www.ws-brandschutztechnik.de/produkte/helme.html
>
>aluminium foil faraday effect with padding plus style ? bravo

As you might know, aluminium devices of this kind are often used in a dangerous way. Cosmical rays, refelcted by earth, may be trapped in the hollow sphere and come to an even more dangerous level.
So the device needs to be worn with the hollow surface upside!
Prefer devices from oversea with wide rim.