Description : Anti-Radiation Cotton Military Cap Cadet Flat Baseball Effective Shielding Signal Fluctuation 99.99% Hat Outer fabric:100% cotton fabric; Internal material:Radiation-proof lining; 53% Silver fiber nanolayer Snap closure Size: 53-58cm/20.8-22.8inch 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 |