Splash About Nappy Liners These soft nappy liners are available in packs of 25 and specially designed to be used inside the Nappy Wrap or Size Adjustable Under Nappy to complete the Happy Nappy system. After swimming, in the event of any little accidents, the nappy liner makes changing and cleaning much simpler. Simply remove the Happy Nappy and nappy wrap or size adjustable under nappy and flush away the soiled liner. The fully biodegradable liner saves you money and saves the environment at the same time. These super soft, biodegradable, flushable liners, form part of our fantastic new environmentally friendly nappy system. They can even be used in warm, treated water.