RF Blocking Headphone Covers

You’ve probably seen competitors claiming a flat "99.9% protection" across the board. We don't do that. Why? Because in the real world, an unchanging number is scientifically impossible.

When you use our covers, your actual reduction will consistently land between 90% and 98%.

There are two simple reasons for this range. First, every headphone brand is built differently. The strength and location of the Bluetooth transmitter inside a Sony headset is different than a Bose or an Anker. Second, your headphones are constantly adjusting their signal strength on the fly to keep your audio connection from dropping out.

We prioritize verifiable science over marketing hype. We would rather give you the honest, measurable protection range you will actually experience in everyday life than a theoretical maximum tested in a vacuum.

Sound and radio frequency (RF) are completely different types of physical energy. Sound travels via mechanical waves—vibrations moving through the air. Because both our outer fabric and inner shielding liner are highly porous, air and sound vibrations pass through them freely. RF radiation, however, consists of electromagnetic waves. Our shielding fabric features a highly conductive microscopic mesh that acts as a Faraday shield. While air moves through the pores of the fabric, this conductive grid intercepts and disperses the electromagnetic RF energy, blocking it before it reaches your body.

Real protection should be measurable. We actually want you to test our headphone covers. But testing can be surprisingly tricky if you don't have the right equipment.

First, make sure you are measuring the right thing. Our covers are engineered to block high-frequency RF radiation from Bluetooth and wireless transmitters. They are not designed to block the low-frequency magnetic fields (measured in milligauss) generated by the physical speaker magnets themselves.

Second, watch out for overly sensitive meters. What happens if you put a highly sensitive RF reader directly against an active Bluetooth headphone? It often maxes out the display instantly. Even with a massive 90% to over 98% reduction from our shielding, the remaining radiation might still completely max out your meter's display. It makes it look like the cover isn't doing anything.

Think of it like testing a blinding flashlight with a hyper-sensitive light meter meant for a darkroom. If you point the flashlight at the meter, it maxes out instantly. If you put a dark lens in front of the flashlight that blocks 90% of the light, it is a massive drop in brightness. But to that hyper-sensitive meter? The remaining light is still enough to push the needle completely off the charts.

To get an accurate reading, you need an EMF meter with enough dynamic range to measure the actual drop. Want to see exactly how to do this? Check out our video page to watch how we test our cases. While those products are different, the underlying testing principles are the same.

Hand wash your headphone covers in cold water with a mild detergent. Pat them dry with a towel to remove excess moisture and allow them to air dry completely. Washing will not affect the material's EMF blocking capabilities in any way.