How does a tri-fold case protect glasses?

The panels fold into a structured shell that surrounds the frames and keeps them from being pressed flat. It is stiffer than a fabric pouch but not a hard crushproof box.

Does it really fold flat?

Yes. The case collapses into flat panels when empty, so it takes little room in a bag or suitcase. It expands back into shape when you put glasses in.

Will it fit large frames?

It is built for standard glasses and sunglasses. Very large or thick frames may fit tightly, so check the folded dimensions against your frames.

Is it good for travel?

Yes. The flat-fold design saves space in a packed bag, and the structured shell still shields frames in transit. It is lighter protection than a hard case.