
These glasses are so light you'll easily forget you're wearing them. They are also very comfortable, at least for me. Made entirely of very thin plastic, they feel (and look) fragile. But if you don't mind that look and feel, they probably aren't brittle in the sense that they're easy to break. The plastic they're made of is pretty flexible and flimsy, so I think you can sit on them and maybe even step on them without hurting them.

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