I bought a pair of these as well as a pair of the Berkshire Trend Trouser Sock 6423 to compare.  They are equally elastic and fit my foot similarly (I wear a size 8.5-9 shoe).  The queen size package said it fits size 10-12 and the non-queen size package said fits size 9-11.  I presume these are sock sizes.  I have a large calf and both stayed up fine and didn't cut off circulation (as another reviewer said).  These seemed like slightly opaque knee high stockings more so than trouser socks and I'll see if they last through the wash better than knee highs. I have other trouser socks that I'd describe as similar in weight to a pair of tights and these are more similar to a pair of stockings than to tights.

The main difference between the queen and regular size was the queen size came up to my knee (I'm 5'2" tall) and the regular size came to mid calf.  I prefer knee high on my trouser socks and if I were to buy more, I would get the queen for that reason.

One other reviewer mentioned the seams at the toe bothering her.  I routinely wear trouser socks with dress shoes and the seams on these trouser socks were much thicker and more noticeable in a bad way, perhaps because the "sock" is much thinner.  I have decided I will not buy these again for that reason.