October 26, 2025

We tested our Ultimate Outdoor Jacket's EMF blocking performance

At SHIELD Signalproof Apparel, we don’t just make claims, we provide proof. The modern world is saturated with invisible electromagnetic frequencies (EMF), and our mission is to offer you a tangible, scientifically-backed layer of protection. That’s why we took our Outdoor Ultimate Jacket to a professional lab to put its signal-blocking capabilities to the ultimate test.

This blog post breaks down the science, the test, and the undeniable results.

A deep dive into $\text{EMF}$ shielding

To prove the jacket’s effectiveness, we used a highly precise scientific instrument called a Scalar Network Analyzer ( $\text{SNA}$ ). Think of it as an electromagnetic lie-detector for fabric.

The setup: sending a signal, measuring the loss

The test works like this:

A Signal Generator sends a known, controlled radio signal through the fabric.
The $\text{SNA}$ measures how much of that signal is blocked on the other side.
The result is expressed as Insertion Loss (or Shielding Effectiveness), measured in decibels ( $\text{dB}$ ).

The $\text{dB}$ scale is crucial here. It’s a logarithmic scale, meaning every $10 \text{ dB}$ increase represents a $10 \text{x}$ improvement in blocking power.

2. The $\text{SNA}$ tracking results: What the graph reveals

The image below is the raw, scientific data for the Outdoor Ultimate Jacket's shielding fabric.

Key Interpretation: $-40 \text{ dB}$ to $-50 \text{ dB}$ consistent protection

1. The Frequencies Tested: The graph runs from $300 \text{ MHz}$ up to $2,500 \text{ MHz}$ ( $\mathbf{2.5 \text{ GHz}}$ ). This is the absolute most important range, covering everything from:

- $\text{4G / 5G}$ Cellular Signals
- $\text{Wi-Fi}$ and $\text{Bluetooth}$
- $\text{GPS}$ and other everyday wireless communications

2. The Blocking Power: Look at the vertical $\text{dB}$ scale. The red ( $\text{Average}$ and blue ( $\text{Realtime}$ lines consistently stay between the $-40 \text{ dB}$ and $-50 \text{ dB}$ marks.

- In plain English: At its weakest point, the jacket's material still blocks over $\mathbf{99.9\%}$ of the signal.
- On average, the jacket fabric blocks between $\mathbf{99.99\%}$ and $\mathbf{99.999\%}$ of the electromagnetic waves in this critical range.

3. Peak Performance: The lines frequently dip down towards the $-60 \text{ dB}$ line, especially near 1 $\mathbf{1 \text{ GHz}}$ and $\mathbf{2 \text{ GHz}}$ (common $\text{WiFi}$ and cellular bands). This shows the fabric is capable of blocking up to $\mathbf{99.9999\%}$ of the signal!

The Conclusion is Clear

The $\text{SNA}$ Tracking proves that the Outdoor Ultimate Jacket is not just a regular piece of outerwear; it is a meticulously engineered, flexible Faraday Cage. It provides an exceptional, measured barrier against the constant digital "smog" of the $21\text{st}$ century.

Built for the Wild, Designed for Your Health

The technology that provides the $99.99\%$ proven $\text{EMF}$ attenuation, a proprietary conductive fabric, also makes this a superior outdoor jacket.

Nickel-Based Shielding: Our shielding layer uses materials (such as $\text{Nickel}$ -based alloys or $\text{Silver}$ that are proven to reflect and absorb electromagnetic energy, providing the $\text{dB}$ performance you see in the chart.
Performance First: It’s fully windproof and waterproof, ensuring you stay dry and comfortable whether you're hiking a mountain or just running errands.
Naturally Fresh: The conductive properties of the shielding material are also naturally antimicrobial, helping the jacket stay fresh and odor-free, even after a tough trek.