2 rolls of 80 biodegradable liners in PLA (a modern polyester derived from natural starches or sugars) cut to fit your Pop-in but may be used with any reusable Diaper. They make our reusable Diaper more flexible, allowing you to use it in the way you want to, when you want to… Reducing mess when storing dirty nappies and doing your laundry. The liner allows moisture to pass one way though the Diaper to help baby dry, whilst also retaining solids to help keep your Pop-in clean. After use, if they are wet, they can be placed in your bin or flushed away if soiled. With a lovely soft texture they are great for the most delicate bottoms, helping to keep baby dry.