All of our items are authentic. If you wish to have them authenticated use a legitimate authentication service. Simply send them the link to the listing and they give you an answer within 2-3 days. Please note, retail sales associates are NOT authentication experts.All sunglasses and eyeglasses are adjustable. If you find they fit too loose or too tight upon arrival, they can easily be heated and adjusted. Please refer to YouTube or take them into an optical store to have them adjusted.