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Customer Review of Britax Römer Kidfix 3 S

Our customer, Amber Parslow, has so kindly written a review of the Britax Römer Kidfix 3 S that her daughter Esme uses. Read what she has to say about the popular high backed booster below.


Anyone who knows me, will know I am very particular about car seats. My children were and are rear facing for as long as possible.

Esme outgrew her extended rear-facing seat (up to 25kg) at 6.5 years old and I did an inordinate amount of research on the best forward-facing high back boosters.

This seat is a group 2/3 seat meaning it is suitable for 15kg - 36kg. Approximately 3.5 years to 12 years, however, I would always advocate staying rearward facing as long as possible.

If you are considering moving to a high back booster earlier, please make sure your child is “booster trained” meaning there are mature enough to know to sit up straight, not lean, pick anything up or slouch. They should also not fall asleep in the car.


Britax Kidfix III S Car Seat Review


Britax is a great make, known for its above and beyond safety testing and quality build. When this seat arrived, I was pleased that it lived up to their reputation.

The base cushion of the seat is large to allow for growth, well padded, and it adjusts to angle of the seat. One of the reasons we went for this seat, is if it’s going to last until around 12 years old, it should be comfortable!

The instructions were simple, and it was quick and easy to install, and using the isofix feature the seat feels very secure. (My friend uses it without and the seat still feels very secure with her child in, but it requires the seat to be packed away if she’s not in it as it isn’t secured.)


The features of this seat, over others, that particularly interested me were…

  • Shock absorbing XP-PAD on the seat belt, which not only adds cushioning but also works as a buffer to protect your child’s chin hitting their chest in the event of an impact.
  • SecureGuard feature (which I’ve never seen before). This sits in-between your child’s legs and adds a 4th contact point to the 3-point seat belt, which keeps it in the correct position over the chest and offers increased protection to the abdominal area.

  • SICT - side impact protection. This clever device twists out on whichever side is closest to the door, to create less space to absorb more impact.

Britax Kidfix 3 S High Back Booster Review


This seat comes in a variety of colours, and removable washable seat covers. Which is great for us, as our children are often covered in all sorts of mess from painting or splashing in muddy puddles!

We are really pleased we chose this seat, Esme is happy and comfortable, and the extra features put this seat above and beyond its competitors. I have recommended this to many friends as a perfect high back booster when your child is ready to make the transition.


Follow her Instagram here.