Before I bought these, I did research on RFID blocking and the different wavelengths. I found an article that said that this product covered both types of wavelengths even though it does not have government certification and several others that DID have certification only covered one type. For this reason I picked pacsafe over the other brands. The sleeve is sturdy and fully covers the card while leaving a small dip at the edge to allow you to grip your card to pull it out. I am looking forward to using this on my next trip. Sadly Pacsafe has a supply problem with many of their products and I was not able to get the passport cover as well. I will have to choose another company to get my passport cover. Pacsafe for all the supply problems (since March on many items) is still the best choice in my opinion. Use these sleeves and feel confident.