
I've only used them once but I've put them on and off a few times and experimented with adjustments. The construction seems solid to me. I know there are other reviews that have broken them but so far so good. I wore them kitesurfing and they worked great. Since I'm still a beginner, I've been in the water a lot and even had a few accidents. All the while the glasses never fell off and didn't even get weaker. I even forgot they were included. Overall I was impressed with the fit, quality and functionality of the glasses.

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