The Prem-I-Air eco-friendly moisture absorbing dehumidifier (Twin Pack) is the ideal product to manage in-car condensation, it also helps prevent misted up or even iced-over inside windows in those cold winter months. The black flannel bags contains Synthetic Silica beads that absorb 60% of its weight in moisture, extracting the humidity from the car interior like a magnet. The benefits of using this eco-friendly dehumidifier in your vehicle are that it can reduce mould, mildew, musty odour s and even prevent rust. The product can be re-used after approximately 3 months of use by simply drying it on a radiator. It is also ideally suited for use in caravans, boats, garages and most places were moisture needs to be managed.