Is the SL581 a men's or women's frame?

It is sold as unisex. The square metal shape is cut to suit most face shapes, so it is worn by both men and women.

How does it compare with Saint Laurent's acetate frames?

The SL581 is much slimmer and lighter than models like the SL M40. It is quieter in style and less of a statement, but easier to wear every day.

The standard SL581 lenses are tinted but not polarized. Check the specific colorway if polarization matters to you.

Saint Laurent sunglasses normally ship with a branded hard case and cleaning cloth. Confirm the contents with the seller for the exact colorway.

The frame is narrow by design. If you have a broad face, try it on or check the temple-to-temple width, since slim metal frames can pinch.

At StockX, for $144.00, 34% under what the other stores charge, as of our latest check.

Yes: $144.00 is the lowest price we've seen for it since November 4.

17 stores we checked sell it, including Ashford.com, EZContacts.com, Overstock, Beverly Hills Eyewear, Poshmark.

$144.00at StockXChecked Nov 9

34% under what the other stores charge

Compared across 18 stores. Prices are checked against each store and labelled with when.