resplabs CPAP Mask Liners - Compatible with ResMed AirFit F40 Full Face Mask - Reusable, Washable Fabric Comfort Covers - 4 Pack (Large)

I have mask cover for my f40, it helps with the irritation I was getting at the bottom corners of the mask. I got it from Amazon, here is the link: https://a.co/d/09oyCf42 I have been using them for 2 weeks now. I rotate them out when I clean my machine on the weekend and they will get washed in a bra bag with my regular laundry.