The Hot Box Winterizer separates the warm air inside the hive from the cold outside air, reducing condensation within the hive. Insulation material in the center of the Hot Box helps retain heat within the hive. The included moisture board draws liquid away from the bees and ventilation helps speed up evaporation to keep the bees dry. Includes bee escape holes which are the correct size for bees, but prevent small animals like mice from entering the hive. Made of solid pine. Fits any standard Langstroth Hive. Complete instructions included.