Given that they are not specific about what materials they use I can't help but wonder if they are just selling expensive organic cotton clothes labeled as baby protection.
How do Belly Armor products work? Without getting too deep into the details...
Indulge me, go into the details.
So apparently their Farady cages work like two completely different physical phenomena, neither of which is anything like a Faraday cage. I'm also amused by the fact that if it really works like noise cancelling headphones, belly armor actually emits radiation!