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You should purchase a new radiation-shielded hat in case you are concerned with radiofrequency radiation by mobile phones, Wi fi, or 4G. These types of hats are made from specialized components and custom-stitched to block EMR penetration. Intended for added security, they have an even top and strap. These kinds of hats are manufactured in Canada. Cellular phones emit RF radiation EMF protection caps can reduce your current exposure to RF radiation. These hats are not perfect and even cannot be examined for effectiveness by placing a mobile phone within the ear