This my first year of beekeeping and I'm getting ready to winterize the top bar hive. Anyone have suggestions as to what I can use to insulate it once the weather gets cold here in North Carolina? Right now I just have a tarp over it on three sides with the front still open so they can get out and forage on the warmer days. If it's a typical NC winter we'll only have a few days where the temps go below the 20s overnight and not a lot of snow or ice. We do usually have quite a few days of cold rainy weather during the winter. What do you top bar hive folks use for insulation?