These phone bags can be used in 2 ways (except the flexible one). You can use the back pocket to have no reception at all, so no radiation either. The front pocket does provide reception, but the anti-radiation fabric removes direct contact between your body and the device. Being unavailable for a while, no distractions, no radiation exposure for a while is very healthy for your body. The bags are used, for example, in schools. Airplane mode does not completely shield the radiation, these covers do. A very simple way to properly protect yourself against radiation from the cell tower, WiFi and Bluetooth.