Pixelated
Moderator - CPST Instructor
And as I recall, Diono has since said, "follow your manual" and retracted their statement about support being needed.
Wendy
I emailed Diono yesterday. Here's what they said -- mind you, I am in Canada, and I didn't think to ask if it also applied to the US, but here's what I got:
'When using the Monterey booster seat, child's head must have the support of the vehicle seat back or vehicle head rest behind it (the child's head).
Whether using the Monterey in its high-back or backless configuration, the tops of the child's ears must be below the top of the vehicle head rest. In the case of vehicle seats that do not have head rests, the tops of the child's ears must be below the top of the vehicle seat back.
I, too, am of the opinion that if there's so much confusion about use that an official statement of clarification could be issued.