These work great. Especially if you have a silicone face shield, they sit right in behind that and wont fall out during travel or storage.
Pros: Lightweight Snug fit Functional
Cons: Could be softer/less textured. A microfiber material would have been better.
I'd recommend these as a lens cover, gives piece of mind that the lens wont get scratched while travelling in a case, and keeps direct light out while storing on table top.