I apologize for not posting up my tight review. It ended up being a bit more cold that originally predicted and I cheated and wore tall boots with my tights.
That being said I wasn't cold and I think the fact that they were cable knit helped. I'm not sure how they would perform in -20 weather but I'm sure I'll be finding out soon.
I'm still looking out for the perfect pair of plus size winter tights. I know they have to be out there, somewhere