SIO basic is a special nappy insert called nappy base. It is very absorbent.
You simply attach this nappy insert to One Size Cover (by snaps)! You only change the insert in the cover.
Can also be used for Petit Lulu Newborn Cover. In this age of your child, you can only fold it so that it fits to the Newborn Cover. You can also use it together with any other cover (without snapping).
Made of 100% natural material!