made of 1mm supple, stretchy neoprene and finished with super soft, snug fitting, deep bands of fabric with a high rubber content to keep all nasties inside. The Happy Nappy was designed by swim teachers, parents and babies in mind! So simple and yet so effective, no ties, no Velcro, no elastic. It is the easiest swim nappy on the market to get on and off, and is really comfortable for your little one.