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Pram liners have to be resistant to outside weather conditions as well. Hence they are very often made with a cotton summer side and a winter fleece side. By using a pram liner you are protecting the original pram cover, while making your baby more comfortable. Usually the pram liners are filled with wadding and have openings designed for safety belts. However, these openings have to be cut through. The pram liners are machine washable at 40 °C and cannot be bleached or dry cleaned. They can be spun at a low speed.