Hi
there are 2 main types- disposables- from supermarkets, even some pools sell them (VERY expensive, and obviously not “green”) and washables- Mothercare, second-hand, online.
the point of them is not to catch wee- swimming pools filter and chemical the water so they are not worried about it- but they don’t want poo in the pool (poo in the water means the pool must be closed for 2-12 hours depending on their cleaning system, so they get rather upset about it!)so whatever nappy you choose needs to be reasonably tight around the legs/ waist so nothing “escapes”, I used ones with elasticated legs but found they were either too tight or too loose, personally I prefered the ones with velcro tabs so I could adjust them.
Also, obvious I guess, but some people don’t realise- if your baby does poo in the nappy, it will be trapped in the nappy- but not for long, so change them straight away!- speaking as an ex-lifeguard, it is not fun standing on poolside with a fishing net trying to catch the floating bits for half-an-hour!!!!
Gill
x