I wear glasses, so these metal bands help reduce fogging of glasses.
I have one strong suggestion. Your metal bands have a hole on each end to sew the strip on each end. In sewing and wearing, I recommend you add at least one more hole in the center of the strip where it bends over the nose. Two holes would be better.
Your shipment was very quick, and not wasteful in packaging. All in all a lasting product. Thank you.