Who needs cell phone shielding in a pillowcase? If you know anyone who puts their phone under their pillow (where it can radiate their sleeping brain all night), they really need this shield. Benefits both teenagers and adults alike. Both luxurious and practical it looks and feels like a normal white pillowcase. Cotton based, machine washable (no bleach!) but with superfine silver fibers (you need a microscope to see them) woven into it. Each layer provides ~90% signal reduction, and there are two layers in a pillowcase! Phone function and sound quality are not affected. Finished size is 20×30 inches, for standard pillows. You can put a standard pillowcase over this one if you want to wash it less. Note: we don’t recommend having a cell phone anywhere in the bedroom. But if you must, shield wisely.