Not sure what I was expecting...
I'm not sure what I was expecting, but these are basically rubber bands with loops on the end that do not stay in place all that well.  And that I also suspect bent my new eye frames a bit.  Now that could be a fault of the frames, but they were fine before I tried this strap.  And frames are a whole bunch more expensive.  May work fine for you.  But I stopped using shortly after I received.
Rating: 1 stars