AMAZING! I had a previous pair of Ray-Bans where the plastic also stretched and slid all over my face and I wish I had known that years ago! I've only had these glasses for a few months, only wear them at night (as I wear contacts during the day) and have had to adjust them 4 times due to the plastic stretching. They were so loose that even tilting my head slightly they kept slipping down my nose, but I only needed 1 strap per loop (pictures attached) and now they fit PERFECTLY! My frames aren't very thick either (the shoulders are only about 1/2 inch wide) and the strap slipped right into the loop! I also didn't soak the straps in hot water like the previous reviewer recommended and they still slipped with no problem. Depending on how big and loose your frames are you may need more than 1 strap per loop, but for mine 1 was enough I would try wearing them with a strap for a few hours before putting on some straps because they stretch a bit. This is the best ever and at a very reasonable price! We'll see how many months it will be before I have to replace the belts, but for the price and the amount you get, either way it's a much better deal than wasting all day making sure that your glasses are set correctly the time. Also, it can wear out your frames faster (my last pair of Ray-Bans started cracking at 1 loop from being reworked so many times). Overall it's amazing and I would 100% recommend it! I will buy more when I run out.
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