These nappies incorporate an absorbent inner with an attached waterproof outer layer, doing away with the need for a separate wrap. They are very simple to use, but can be slower drying. Additionally, in moving away from a two piece system you are likely to find a decrease in the level of containment however they will still perform better than a disposable. You should also bear in mind longevity of the product, all in ones are washed after every single nappy change which means they will wear faster than two part nappies. If you are planning more children this might not be the right product for you. as they may not last beyond one child. They are perfect for childcare or the change bag.