Britax Römer Kidfix III M Booster Seat

The Kidfix III M uses ISOFIX connectors to anchor the seat to the vehicle and the car's three-point seat belt to secure the child. The ISOFIX attachment also keeps the unoccupied booster from becoming a projectile when the child is not seated, which is a legal requirement in many European countries.

The Kidfix III M is a Group 2/3 booster seat designed for children weighing approximately 15 to 36 kilograms, generally corresponding to ages 4 through 12. It is not a rearward-facing infant or toddler seat but rather a high-back booster that positions the adult seat belt correctly across the child's shoulder and lap.

Yes, the Kidfix III M features a multi-position adjustable headrest that can be raised in increments as the child grows taller. The seat-belt guides integrated into the headrest ensure the diagonal belt sits correctly across the shoulder rather than cutting into the neck at any height setting.

The Kidfix III M was designed with a slimmer external profile than earlier Kidfix generations to make it easier to place multiple seats side by side. Britax specifically markets the reduced width as a feature for families needing to accommodate two or three children in a single vehicle row, though exact fit depends on your car's rear seat dimensions.