For our line of FIE 3 weapons masks, we offer replacement padded liners! While the new masks come with a liner, they will wear out and break down over time. Sometimes the liners just get gross… well mine does. So it is handy to have a way to replace the entire inside of your mask. The liners are held on by velcro so just make sure you pick the right size and installation of the new liner is a snap.