FID fabric blocks radio waves from getting near your ID and/or credit cards and sending this information to a detector or reader.
Line anything you carry identification and/or credit cards in with this special fabric that has a 99.99% shielding efficiency.
Only 0.085 mm thick so it will not add a lot of bulk to your purse, tote, or wallet.
Hand wash or clean with wet tissue using cool water; no bleach nor ironing
Sewing machine needle recommendation: sharp needle size 80/12