Many posters want them.
Buy before the Christmas rush.
http://www.cnn.com/2002/TECH/ptech/11/19/norway.cap.reut/index.html
It may protect you from your cell phone but the MLB spy satellites use a different frequency that goes right through.
Dammit.
Can you wear one frequency hat over the other?
Well, you can wear up to three hats, but once you’ve protected yourself from the cell phone, the spy satellites, and the thing in your refrigerator that makes it hum, what will you do about the guy next door who’s shooting gamma rays into your apartment to kill you and your cat?
And what about the poor cat?
You think I’m crazy?
Nobody would beam rays at the cat. PETA would get them.
What is the frequency, Kenneth? 
I don’t think I want one of those hats. What if they keep the micro waves out too? Micro waves kill germs(which is why meat is irratiated, you know, not just so we’ll glow in the dark, though that is cool), and probably prevent head cancer. I really don’t want head cancer.
You can paint the hat with Day-Glo.
Get with the program, elfkin.
Well, duh! You modify an infant’s tin foil hat. You’d be amazed at how little effort is required. Makes sure you get the size for a newborn because toddler sizes are too big and you’ll have to double up the foil. You just need to be really careful when you add slots for the cat’s ears. If the earholes are too big, the gamma rays go straight to the cat’s brain.
It’ll take a few weeks for the cat to adjust. Fluffy has been wearing one for three years now.
The only problem I’ve found is that long-haired cats build up a lot of static.
Why all this protection? You know if you really need one, the Orbital Mind Control lasers have already gotten to you.