I don't have socks. I have one pair of pantyhose that are 30-40 mm (those are the ones that really kill my feet, don't remember the brand), one pair of the ugly white Futuro thigh-highs that are 15-20 mm, and one pair of thigh-highs that I remember as being 20-30 mm but I'm not exactly sure the brand, they might be this Sigvaris pair.

I do feel I get a benefit even from the lower compression of the Futuros, especially since I can wear them longer. I'll definitely wear wool socks over any of them, not only to keep my feet warm but to protect the nylon.