EMF PROTECTION: RadiArmor’s EMF blocking pouch is lined with a proprietary metallic fabric that blocks 99% of high frequency RF radio and microwave radiation. Effective EMF reductions is between 91% to 96%. | HOW IT WORKS: Only the backside of our EMF blocking sleeve is lined with our proprietary anti-radiation material. This creates an EMF blocking barrier between you and your phone while still ensuring normal cell phone reception. | UNIVERSAL FIT: RadiArmor’s EMF blocking sleeve is made of flexible neoprene and measures 7.1 inches long by 4.15 inches wide. Fits most cell phones, including larger size phones such as Samsung Galaxy S10 and iPhone Plus and more. | INTEGRITY: Most companies who claim 99% EMF reduction refer to their EMF blocking fabric, not the EMF reduction you receive. Some companies even sell stickers and pendants with a tiny piece of EMF blocking material and claim 99% reduction, but the real reduction to you is zero or sometimes worse, especially if applied to the back of your phone. RadiArmor only sells products that provide real protection and is based on scientific principles. | LIFETIME WARRANTY: Our EMF blocking phone sleeve comes with a lifetime warranty. If you have any issues with your sleeve, please reach out us by clicking on 'Beacon Health' next to where it says 'sold by' on the product page and send us a message.