The Science
Every Eswear brief carries a three-layer panel with a stainless steel core, built to reflect the radio-frequency energy your phone sends out while it sits in your pocket.
01 · The problem
Phones constantly check in with cell towers and Wi-Fi, even when idle. Manufacturers test their exposure limits with the phone held some distance from the body, yet most men carry theirs in a front trouser pocket with only a thin layer of cotton between the device and the groin.
02 · How it works
The shielded panel works on the Faraday principle: a conductive surface reflects electromagnetic waves instead of letting them pass. We place it only across the pouch and front pocket zone, so the rest of the brief stays plain, breathable modal.
The surface you see and feel. 90% modal, 10% elastane for softness and recovery.
Fine stainless steel fibers knitted into a flexible, conductive mesh. Reflects RF energy outward and keeps its shielding wash after wash.
Keeps the steel layer off your skin. Soft, breathable modal against the body.
03 · With vs without
Share of RF signal passing through the fabric
Share of RF signal passing through the fabric
04 · Lab results
Shielding effectiveness of the fabric, measured by CSIR-National Physical Laboratory, New Delhi, in a TEM cell (report 25050124/D#6.03a/T-013, June 2025). Uncertainty ±1.0 dB (±1.5 dB at 3.3 GHz).
| Band | Attenuation | Blocked |
|---|---|---|
| 900 MHz · 2G/4G | −19.5 dB | 98.88% |
| 1200 MHz · L-band | −18.7 dB | 98.65% |
| 2400 MHz · Wi-Fi | −21.9 dB | 99.35% |
| 3300 MHz · 5G | −30 dB | 99.90% |
05 · The research
Research on mobile phone RF exposure is ongoing. These are the sources we point customers to.
Environ Int · 2014 · Adams et al.
Pooled 10 studies (1,492 samples). Mobile phone exposure was associated with lower sperm motility and viability; effects on concentration were less clear.
Read on PubMedEnviron Int · 2024 · Kenny et al.
A WHO-commissioned review of 9 human studies. It rates the evidence as very uncertain and calls for more rigorous studies with better exposure measurement.
Read on PubMedWHO · IARC · 2011
IARC classified radiofrequency electromagnetic fields as possibly carcinogenic to humans (Group 2B).
Read sourceFCC
How phone RF exposure limits are measured, and why tests use a separation distance from the body.
Read sourceNo. The shielded panel sits between your phone and your body, not around the phone. Signal to the tower is unaffected.
No. The steel fibers are knitted into the mesh, not printed or coated on. Lab tests show shielding retained after 100+ washes. Wash cold and use the mesh wash bag to protect the panel.
The steel layer never touches you — it sits between the modal outer and a modal lining. The fabric is OEKO-TEX® Standard 100 certified.
That's where your phone sits. Shielding the whole garment would make it warmer and stiffer without adding meaningful protection, so the rest stays plain, breathable cotton.
