What size are these chinos?

They are listed as fitting a 31-inch waist with a 30-inch inseam and a 10.5-inch rise. Check those measurements against a pair you already own, since secondhand sizing can differ from the tag.

What condition are they in?

Condition is described as good, with a mark on the back. That is the only flaw noted, so inspect the back area closely if the mark matters to you.

What are they made of?

Cotton. The listing gives no stretch content, so expect a standard woven chino fabric rather than a stretch blend.

Yes, they are listed as 1990s Boss chinos. That means the older Boss cut and labeling rather than the current line.

How do they compare with new chinos?

You get a vintage Boss cut and a pink color you are unlikely to find new, but only in this one size and with a noted mark. New chinos offer fresh condition and a full size run.