Our Littles&Bloomz Pocket nappy made from PUL, polyurethane laminated on the back of fabric for waterproof purpose. It works by insert an absorbent pad into nappy shell and has many pretty design patterns available. Special designed pocket opening for easy stuffing and removal. We have 3 types of pocket nappies, standard fleece, bamboo and Charcoal. The types refer to materials of inner layer. Standard Fleece is most popular, stay dry and value in money. For more, please feel free to contact our customer service to check.