Does this exact - warm knee-high sheers ?

[OakElmAsh]

I think i might be looking for something that doesn't exist but here it goes ... I have permanatently cold feet, but i want to wear nice loafers, pumps, ballet flats etc with trousers, but i can't wear barefoot as i get blisters galore, and also find that my feet are feezing in sheers. I also don't like the look of proper socks with anything other than trainers or boots (awkward i know)

So, do they exist ? I've seen tights that are sheer effect but fleece lines, but i've never seen ankle or knee high versions

Not sure what you mean by sheers?
But is this the sort if thing you're after?

https://www.marksandspencer.com/4pk-15-denier-medium-support-knee-highs/p/clp60630391?color=ROSEQUARTZ#intid=pid_pg1pip48g2r2c2

So that kind of thing.... but warmer! I may be on a wild goose chase....

I think you may be hunting a unicorn!
Ive seen sheer looking thermal tights and leggings but never knee high socks.
I can sympathise though. My feet are permanently freezing too. Id love to wear the ballet flats I have but its always too cold!

No - because if they were any thicker they would look like those hospital compression socks.

Look here they might be a tad expensive but are worth it https://www.falke.com/uk_en/women/socks-hosiery/knee-high-socks/