Strap would be great if there were adjustable straps on each side. They were unusable in the form in which they were delivered. What I did was cut the adjustable strap and locking mechanism (because the lock has to be used to connect to the other side) on 2 of them and replaced the non-adjustable ones on the other straps. I connected the two ribbons with a ribbon. Unfortunately one side is a different color than the other but it suits my purpose of wearing glasses. The quality control of these tapes could be better. One of the black straps was twisted, but it's comfortable and uncomfortable.
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