Wicking? Is it a barrier or does it allow drying out? Does wool actually win ?
Wicking doesn’t make waterproof but facilitates drying, or wetting. Ideally you want one way wicking, if there is such a thing, away from the wall, with sufficient ventilation to ensure the surface remains dry.
When I was learning mountain craft as a youngster and before a lot of modern fibres, I was taught that wool is the best insulating layer as it works when wet.