These polarized sunglasses fit snugly over your prescription glasses. They are sleek and stylish and not huge. They come in different sizes to fit most glasses and in different styles to suit different facial shapes and likes. I lost my original pair while on vacation and quickly replaced as soon as I got home. These are my go to sunglasses especially when driving . These can also be worn alone without your prescription underneath. They still look great. Very reasonably priced!!