Some seats have a reclining backrest which support their head when they nod off.
Chrome tubular engine guards front and rear, a padded backrest and sturdy aluminum passenger grab rails are just part of the story.
Finally he settled for the lightest seat that had a backrest to it.
Your chair seat may also be too long, preventing you from using the backrest effectively.
A contoured backrest can potentially ' fix ' the young person in an undesirable position.