Does EMF shielding paint or fabric actually work?
Some of it does, in a narrow sense: certain metallized fabrics and metal meshes measurably reduce radio signals passing through them, while many paints do very little. A room is only as shielded as its weakest opening, so partial shielding often changes less than the label suggests.
What "shielding" actually means
Shielding is measured in decibels, a logarithmic scale. A material rated at 10 dB cuts the signal power to one tenth, 20 dB to one hundredth, and 30 dB to one thousandth. That sounds dramatic, and it is, but the number only means something at a stated frequency. A rating taken at one frequency tells you little about another, so a single dB figure on a product page is incomplete without the curve behind it.
What testing of home materials found
A study of shielding solutions for homes and workplaces compared graphite-based paint, wire netting, foil paper, metalized fabric, and transparent conductive film. In the controlled tests, metalized fabric performed best, followed by iron wire netting and foil paper. Iron bars gave moderate screening, while graphite paint and a plain metal frame had little effect. That is one study, but it matches what a lot of people find in practice: the material matters, and not every product named "shielding" behaves like a shield.
Why gaps matter more than the wall
Radio waves go around, not just through. A painted wall with an uncovered window, a door, or a gap at the ceiling lets signal in, and some of what is blocked can bounce around the room. Window film and treated glass can also weaken the signal your own phone depends on, so devices may work harder to hold a connection. Anyone planning a full room treatment is signing up for a careful project, not a weekend coat of paint.
What the science says, plainly
In 2011 the IARC classified radiofrequency fields as Group 2B, possibly carcinogenic to humans, which means evidence worth studying rather than proof of harm. The 2018 NTP rat studies found some evidence of tumors at whole-body exposures well above everyday levels. The FCC sets exposure limits for devices sold in the US, and the ICNIRP publishes international guidelines, last updated in 2020. The research is still open. We are a small family business, not scientists, and we would rather say that than oversell.
Where distance does the work
Of the three principles we keep returning to (distance, time, and source strength), distance is the one that costs nothing. Signal strength falls off quickly as you move away from a source. Moving a router out of the bedroom, or charging a phone across the room instead of on the nightstand, often does more than a coat of anything, and you can do it tonight.
What a sleeve and a sticker can and cannot do
Our phone sleeve uses RF-blocking fabric, which is the same basic idea as the metallized fabric in the study above, at the scale of one device. Our stickers are made for phones and personal devices, not routers. Neither one is a replacement for distance, and neither is a medical product. This is lifestyle, not medicine.
What to do this week
Pick one room, usually the bedroom, and do the free version first. Move the router to a hallway or another room, and charge your phone a few feet from the bed. If you are curious about shielding, start small, since a fabric canopy or a phone sleeve is a far smaller project than a repainted room, and be wary of any product that skips the frequency and dB details.
That is it. No fear required, and distance comes first.
Optimize your environment. Unlock your potential.
Yarden and Jessica