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You should purchase a radiation-shielded hat when you are concerned about radiofrequency radiation from mobile phones, Wifi, or 4G. These hats are built from specialized materials and custom-stitched to dam EMR penetration. For added security, they have an even brim and strap. These hats are built in Canada. Cellular phones emit RF radiation EMF protection a terrific way to can reduce your exposure to RF rays. These hats usually are not perfect and cannot be analyzed for effectiveness by placing a mobile phone inside the headsets. An EMF colocar is required to