BeeDry is a radiant foil insulation hive wrap, with a top cover insert, moisture control pillow. The pillow wicks away condensation (moisture) build up within the hive, trapping it in the pillow. Therefore bees won't get wet and freeze. BeeDry helps keep air at a constant temperature inside the hive by reflecting (97% of) the radiant heat of bees back to the cluster, at the same time reflecting (97%) outside temperatures away from the hive. Reusable each season.