Choose the Solution B i-Fix high-back booster car seat for a great combination of safety, comfort and ease of use, tested according to the UN 129/04 standard. From the beginning an ISOFIX System helps you install the car seat correctly and safely. No matter how fast your child grows, a 12-position adjustable headrest provides a continuous snug fit and can be raised with one hand. A Linear Side-impact Protection System reduces impact force in the event of a side collision, for extra peace of mind on the road.