Pureborn Nappies Single Pack Size Xl-5 (22) Diaper are ultra-soft, with a cloth-like feel to provide maximum comfort for the babies. They are made with unbleached bamboo fibers in the core layer and soft non-woven fabric on both top and bottom layers to provide the best comfort and protection on the most sensitive skin. The nappys back sheet (outer layer of the nappy) is made with a breathable nonwoven fabric, which regulates the flow of air.