The spectacle itself looks as if it would serve their purpose. Not much more I can to the spectacle but unfortunately not say, because the spectacle could not be in the delivery completely open (only about half, making it prohibitive) as protruding plastic columns are right in the range of motion of the hinge by the Platiskguss yet. That seems like a cheap three Euro Fahrradbrille from the Far East and is a blatant lack in quality control, with the uvex as a German company is here to work. By acquiring a plastic glasses for almost 20 euros I'm trying just such manufacturing defects cheap Asian production to go out of the way. Here obviously in vain.
If at a quality control and only the attempt has been made, expand the glasses once (it is after all the only mechanical function of this product), the error would have been detected immediately. Was obviously not and instead delivered an unusable product. I can only advise against the purchase because of my experience thus.
