They showed up quick and they are pretty durable! The retention springs are a little weak or wear out/ reform , but they can only pinch the nose so hard before it would become uncomfortable, and the grip they provide is plenty sufficient (or even surprising)for being out and about, or driving with the windows down.
If you're going to be sweating the grip disappears. So dont plan on working with them, or playing too hard in the heat. The reflective surface is very revealing ofscratches, so if yo...