Create cleaner, fresher air with DampFree Moisture Absorbers. The crystals work by absorbing excess moisture in the air which gradually dissolves. The captured moisture can be seen inside the pouch, which can absorb up to 800ml of moisture. Suitable for wardrobes, laundries, bathrooms, caravans, windows and boats. Lasts up to 75 days (dependent on temperature and conditions). Ensure that paper side of hanging bag is facing outwards.