These padded side supports sit either side of the hips inside the Trollino seat and narrow it. They suit a smaller child in a chair that would otherwise leave too much room at the pelvis, and they suit a child who needs the hips held against lateral drift.
The padding spreads the contact so the support is felt as containment along the whole hip, which matters for a child sitting for hours. With the extra padding option the seat narrows further again.
Setting the seat width correctly at the pelvis is usually the first thing to fix before anything else in the seating system will hold.






