The Blueberry Simplex is an All-In-One (AIO) and is a pretty great diaper overall.
The diaper is lined in cotton and has a long cotton tongue with fleece on top. The tongue can be laid over top to take advantage of the moisture wicking layer, or you can fold it inside.
You can also stuff the pocket with doublers. The great thing about Blueberry Simplex is that you don’t have to empty this pocket before washing. Because the diaper pocket is open on both sides, the doublers work themselves out in the wash.
Something to be mindful of with AIOs is that there are no double gussets. You also need to make sure that the inner fabric cannot be seen when the diaper is on you baby. If you can see the inner fabric, you can get leaks.