Noemi Foldable I-Size High Back Booster I 100 to 135cm Car Seat

3 across the rear seat was particularly challenging for us because the buckles in the middle were particularly close to each other. This does the job. Naturally it’s narrow but that’s the point. We’re lucky our eldest (age 6 years) is tall and slim. A broader child might struggle. Daughter reports it’s comfortable and she finds it easy to fasten the seat belt.