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# How do I position the booster seat and neck pillow correctly?

Our two ergonomic baby carriers, the [HoodieCarrier 1](https://love-radius.com/en/baby-carrier-hoodiecarrier-201) and the [PhysioCarrier](https://love-radius.com/en/baby-carrier-physiocarrier-46), are available in two versions: the baby carrier alone or the evolution 0-36+ pack consisting of the baby carrier, a booster seat and a neck pillow.

To use, as shown in the video, place the booster seat so that the wide part is under baby's bottom (under the label). Insert it into the tunnel. As for the neck pillow, pass it through the elastic band and clip it in place.

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To go further :

* [What are the booster seats and neck pillow used for?](/hc/en-us/articles/4406226056465)
* [How do I wash the booster seat and neck pillow?](/hc/en-us/articles/4407746348305)
* [When to remove the booster?](/hc/en-us/articles/4406225090193)