The award-winning Happy Nappy™ costume has been designed with a full Happy Nappy™ inside, meaning Baby Swim schools approve its use in lessons, without needing a further nappy underneath. The internal Happy Nappy™ forms a snug seal around baby's waist and legs to prevent faecal leaks into the water. The super soft neoprene bottom is coupled with a soft UPF50+ nylon-Lyra top which is chlorine resistant, providing maximum comfort for your child.