I ordered this retainer because it looks good and is lightweight.  One reviewer said his "expensive glasses" fell off this retainer.  I can't imagine that, since the rubber loops can be easily snugged up and retain their hold well.  I am extremely pleased with the unobtrusive look of this product and the ease with which my readers are always within reach and the lenses don't get smudged from constantly retrieving them from a shirt pocket; and they permit my glasses to be with me when I don't have a pocketed-shirt on (frequently in summer).