Probably what you would expect - square cloths for cleaning glasses. They're moderately absorbent - I've seen slightly thicker, more comfortable ones that work better if you tend to leave a ton of water on your goggles when rinsing them out or riding in a downpour or whatever, but they get the job done . . . manufactured and cheap enough to keep on hand. We're talking about the quality of the free glasses that optometrists sometimes give away with a new pair of glasses.
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