Designed to help prevent musty odours in stored boats, RVs or seasonal homes. Absorbs airborne moisture to help prevent mildew smells. Eliminates mildew odour and other musty odours. Protects boats in storage, vacation homes, basements and other enclosed areas. 340g (12-ounce) size is ideal for protecting boat cabins, closets, small rooms or safes. 1.02kg (36-ounce) size is perfect for salons, engine rooms, campers, basements, garages or other large areas. No Damp Dehumidifier is the effortless way to help control the excessive humidity that leads to musty odours, stains or corrosion aboard stored boats, RVs or seasonal homes. The special crystals automatically remove moisture from the air, depositing it safely in the convenient container. Great for cabins, heads, closets, boats, RVs, bathrooms, laundry rooms, basements, and other enclosed spaces.