Some propolis blankets have holes that bees have gnawed, which they use for ventilation! Cotton fabric blanket. The blanket is an essential part of any hive. It is located under the hive lid to prevent drafts in the hive. The bees themselves saturate the blanket with propolis, wax, pollen, various natural enzymes and other bee-produced products. Propolis blankets heated not only smell fantastic, but also warm and treat tight muscles! If you have a bad cold, put it on your chest to warm it up. Please heat the propolis blanket on the radiator. Can be cut into smaller quantities.