Will these fit over my prescription glasses?

They are designed to clip onto most standard plastic and metal frames. Fit is less secure on very small, rimless or thick frames, so check the clip width against your glasses.

Are the lenses polarized and UV-blocking?

Yes. Foster Grant lists both polarized lenses and UV protection, which is the main reason drivers like them.

Can I wear them without prescription glasses?

No. They are a clip-on accessory with no temples, so they need a frame to attach to.

How dark is the gray tint?

It is a medium gray tint. It handles everyday sun and driving glare but is not as dark as dedicated dark sunglasses for very bright conditions.

Do they come with a case?

They are usually sold as the clip-on alone. The frameless design folds flat, so a small pouch or the car glovebox works for storage.

Are they worth it compared with prescription sunglasses?

If you already wear glasses and want a spare pair for the car, they are a low-cost option. Prescription sunglasses fit better and look better, but cost much more.