https://www.vive.com/nz/support/cosmos/category_howto/removing-the-face-cushion.html
Removing or reattaching the face cushions
Remove the face cushions when you need to access the compartment or clean the cushions.
the faceremovingcushions
https://www.mobileadvance.com/htc-vive-focus-3-face-cushions/
HTC VIVE Focus 3 Face Cushions - Mobile Advance
Mobile Advance - Technology Provider for High Performance Computers, Laptops, Electronics, Peripherals and Accessories
htc viveface cushionsfocusmobileadvance