Built around the frame
An eyewear sleeve is specified from frame width, height and folded temple thickness. Those vary between models more than buyers expect, so a sleeve sized from one frame frequently will not suit the next one in the range.
Where a single sleeve has to cover several models, send the largest and smallest and let the internal size be set against both rather than against an average.
The face that touches the lens
The inner surface is in continuous lens contact, which makes lining choice the most consequential specification on this style and the one least visible in photography. Low-lint, smooth-faced linings are used because they neither shed onto the lens nor abrade a coating.
Approve the lining physically with your own frame inside, and check it after repeated insertion rather than once.









