Leggings Advice

The winter chills are settling in, and its getting to my bones.

I currently have these old polyester leggings, but they're quite bad at insulation (who would guess a plastic bag is bad at), and they aren't the greatest sensory experience.

I want to upgrade to something of better quality, made of wool / fleece instead for the winter.

I typically don't like reusing leggings, so it would have to be cost-effective enough to buy 8 of them.

What do you recommend?