All-In-One Diapers generally have a waterproof outer layer consisting of PUL (polyurethane) backing, polar fleece, or wool. They are a fitted diaper & diaper cover in one & are the closest to simulating disposable diapers next to pocket diapers in that they are a one-piece system. The insert/absorbent soaker is generally sewn right into the diaper or can be detached. A short form for All-In-One diapers is (AIO).
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