Biodegradable Nappy Liners. These biodegradable nappy liners are stay dry one way liners which allow moisture to pass through the nappy, but prevent it seeping back, keeping baby dry & comfortable. Simple & convenient to use One-way liners allow moisture to pass through but prevent it seeping back onto baby's skin Liners retain solids to help prevent soiling of the nappy Biodegradable – they are safe to flush away without harming the environment Convenient rolls with tear-off sheets