Review on Activated Carbon Replaceable Filter Layers by Luis Green

I have just received these baby masks for my children (3.5 and 11 years old). In the photo, child size is at the top and adult size is at the bottom. The stuff on the kids is a lot stiffer than the adults I have, maybe that's a good thing because the adults sometimes fold when I put them in the filter bag. I haven't seen my child use children's sizes but wanted to write about the size difference. Child size 4 x 2 inches.