These are Aigan's "for Yu" sauna glasses. The prescription is [-3]. They are heat-resistant and can be used in saunas and hot spring facilities. They are fog-resistant, providing peace of mind. Used less than 10 times, there are no noticeable scratches or damage. They are still in good condition and ready to use. *The included glasses cloth has been used and will not be included. Please consider purchasing if you understand that this is a used item.