Why is the shielding material only in the front flap of the cell phone case?

Our shielding technology is incorporated into the front flap as to provide protection in the direction of your body while still allowing signal to enter and exit the phone through the back panel. If we were to shield the sides and back, the phone would no longer be able to send and receive signal. That said, close the flap when on a call and position the phone so that the front flap faces you when in your pocket. Note that the flap can be folded behind the phone or tablet to shield the part of the device closest to your body while in use.