Very secure on my glasses and it’s easy to tighten and loosen, but a few cons. 1- my hair always gets caught in it when I tighten, even though my hair is in a pony tail. 2- I purchased a black one and it got super discolored in less than a year. Looks brown now. 3- it is very hard to get on Ray Ban glasses. I did it with a lot of fiddling but it’s a little too tight for glasses with wider ear things (what are the sides of glasses called anyway?).
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