The complete guide
Sizing a One Size swim nappy correctly
A reusable swim nappy earns its keep across a whole term of lessons or a full holiday, so it's worth getting the size and the routine right from the first wear.
Sizing it to your child, not the age range alone
Age ranges on packaging are a starting point — check them against your child's current weight, since a snug fit at the leg and waist is what actually keeps solids contained in the water, not the label.
The between-swims routine
Rinse under a shower or tap straight after swimming to clear chlorine and any solids, then run it through a normal wash before the next wear. It dries fast enough to be ready for back-to-back weekly lessons without needing a second one, though a spare is useful for a multi-day trip.