They say don't test it with a cell phone which makes no sense. If I can still get a cell phone signal of course that means it doesn't work right?

Thanks for the great question. There are 2 things to consider here: 1. Fabric - the shielding fabric is a custom yarn of silver. Our custom shielding fabric can block up to 59dB. To increase the shielding effectiveness beyond that we need to make the fabric thicker which is not suitable for wearable clothing purpose. For your information a very thick concrete wall with steel frames is only equivalent to approx. 35dB. Our shielding fabric provides protection much more than that. 2. Signal strength - in the past we can cut off 3G cell phone signal quite easily using our shielding fabric (we have been providing shielding solution for 5 years). As technology progresses we now have 4G and now 5G, we have found that cell phones now have signal strength much more than 60 dB this means the cell phone still gets the signal. See a video demo attached - a cell phone with 4G signal measures 1,800 mW/m2 drops to below 0.5 mW/m2 Hope this helps.

don't the loose edges of this beanie let some emf in and then trap it in?

I doesn't fit an adult head, It is more of a children's sizing. I bought it for my 8-year-old son, and it is oversized, and fits his active lifestyle.

Can you make a option with thicker shielding material id like the most protection i can get

The shielding effect of the fabric is so high that much more radiation comes from the opening of the beanie and by bending of the rather large wavelength waves at the edge of the beanie than through the fabric. More coverage of your head and body could enhance the shielding effect much more. You should try the hood and try to be in environments with lower level of radiation - for which acquiring a RF meter would be beneficial.

Hello what is the shielding efficiency up to 5ghz? besides aesthetics how does it compare to your other beanie asin b09flszryp

We use the same shielding fabric for all our beanies. The shielding efficiency ranges from 18 to 70 dB, depending on the frequency. We have tested our fabric against the IEEE 299:2006. For your info, even at 10 dB SE that is equal to a 90% reduction of wireless energy.

ASIN	B07V2WKV58
ASIN	B07V2WKV58
Age Range Description	Adult
Apparel Closure Type	Elastic
Best Sellers Rank	#1,009,985 in Clothing, Shoes & Jewelry ( See Top 100 in Clothing, Shoes & Jewelry ) #3,711 in Men's Skullies & Beanies #4,001 in Women's Skullies & Beanies
Brand Name	Radia Smart
Color	Black
Customer Reviews	3.8 3.8 out of 5 stars (97)
Date First Available	July 14, 2019
Department	womens
Fabric Type	100% Polyester
Fit Type	Stretch
Hat Form Type	Beanie
Material Type	Polyester
Occasion Type	Bachelorette Party, Easter, Mother's Day
Package Dimensions	8 x 7.7 x 1.75 inches; 2.72 ounces
Pattern	Solid
Pattern Style	Solid
Product Care Instructions	Hand Wash Only
Seasons	Winter
Style Name	Beanie
UPC	711841740757
Unit Count	1 Count
Water Resistance Level	Not Water Resistant

Fleece Earflap Hat Beanie EMF Protection, Anti-Radiation Cap, Brian Coat,Block Radiation, Black

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