GlassPass is a subscription box that gives you access to an unlimited amount of glasses for one monthly fee. You will receive your chosen pair of glasses you can keep for the length of your subscription. A prepaid shipment box to return/exchange your glasses. A case and glass cleaner you can keep forever! When you want a new style, just ship them back and exchange for a different pair. If you want to keep the pair you have, just let them know and they will give you the option to purchase at discount.