Is the Longchamp LO181S polarized?

No. The lenses are CR-39 with 100% UV protection but no polarization, so they block UV rays without cutting reflected glare the way polarized lenses do.

What size face does the 56mm lens fit?

The 56mm lens width with a 17mm bridge and 140mm temples is on the larger side, so it suits medium to wide faces better than narrow ones.

What comes in the box?

Expect the sunglasses and a Longchamp case or pouch; listings do not specify extras, so confirm with the store if a case matters to you.

Can I swap the lenses?

No. The lenses are not interchangeable, and the purple gradient brown tint is fixed.

How does the LO181S compare with Longchamp's acetate frames?

The LO181S uses a full metal frame with adjustable nonslip nose pads, which is lighter-feeling at the nose than thick acetate but less warm in look. Acetate Longchamp frames tend to be bolder; this one is slimmer and more formal.