Made from super-soft 1mm thick neoprene, the Happy Nappy is designed to be gentle on baby's skin. With no tight elastic, it has been developed to move as your baby moves, so it won't leave red marks or chafe the skin. The snug ribs around the waist and thighs are reliable in keeping in solids and preventing any accidents from leaking into the pool. Regularly voted the most comfortable swim nappy and with no poppers or Velcro, the Happy Nappy is the most secure, leak-proof swim nappy available.