Description : Anti-Radiation Sleep Beanie Hat Cap Effective Shielding Signal Fluctuation Efficiency 99.99% Loose Lazy Chemical 100% Cotton The main function of this product is to shield electromagnetic radiation generated by 4G, 5G, wifi and other signals; electromagnetic radiation generated when making calls, sending and receiving text messages, and electromagnetic radiation generated by small household appliances such as microwave ovens when working The main function of this product is not to shield the signal of the mobile phone or pad Simply wrapping the mobile phone with a hat to see if there is a signal will not be able to test the product performance correctly Unisex anti-radiation hat, fabric composition: outer layer 100% Organic cotton, inner layer: 100% silver fiber£» Nanometer silver fiber worsted technology, good shielding performance, light and thin material, good air permeability |