KIDFIX III S - Apertura

KIDFIX III S, safety and comfort at the highest level

R44/04 - Group 2/3 (15-36 kg)

Premium Line

Based on Britax Römer's popular and successful KIDFIX range, the KIDFIX III S is the brand's most complete highback booster regarding both safety and comfort. Equipped with the larger, more comfortable and ergonomic seating area of the KIDFIX III M, it also features the 4th contact point to the car’s 3-point seat belt, the side impact absorption system SICT and the renewed XP-PAD pad.



Britax Römer has developed a new version of the XP-PAD foam pad, which covers the diagonal section of the belt and protects the child's neck and chest in the event of a collision or sudden braking.

According to tests conducted by the manufacturer in 2019, this Britax Römer patented impact absorption pad deflects up to 30% of the energy away from the child's delicate neck and prevents cervical hyperflexion by reducing head movement. In addition, it provides comfortable padding around the edges of the seat belt.

The XP-PAD has been optimized to offer easier installation, improved seat belt retraction, greater comfort for the child and a more modern design, while maintaining the same safety performance in the event of a frontal impact.



The SecureGuard helps to protect your child’s delicate abdominal area by adding an extra – a 4th – contact point to the 3-point seat belt. By keeping the lap belt in an optimal position over your child’s pelvic bones SecureGuard helps reduce abdominal forces in the event of a frontal collision by up to 35 %*, and at the same time allows your child freedom of movement during the journey.

KIDFIX III S - SecureGuard

Advanced side impact protection

Britax Römer´s high-back boosters protect your child in three ways: the device's shell provides protection from head to hip, especially in the event of a side collision; the upper and lower guides ensure that the 3-point seat belt is correctly positioned over the shoulders and hips; and the padded headrest provides safety and comfort for the child's head and neck.
In addition, the SICT system offers superior child protection in the event of a side impact collision. It reduces the force of impact by minimizing the distance between the vehicle and the seat, and deforms to absorb the energy before it reaches the child. To activate the protection, simply adjust the SICT on the side closest to the door.


Larger and more ergonomic seating area

The seat area is wider, has an improved shape and features a smooth front section to ensure a more comfortable and ergonomic seating position on long journeys, even for taller children. In total, the seat area is approximately 20% larger than that of similar models.

KIDFIX III S - Asiento

Easily adjustable ergonomic headrest

The headrest, 12% larger than in other models of the KIDFIX range, has an ergonomic V-shaped design so the child can sleep in the correct position. It can be easily adjusted with one hand to the correct position, just above the child's shoulders, even when the child is already occupying in the seat.

KIDFIX III S - Reposacabezas

V-shaped backrest

Designed to offer optimum support for children as they grow, the V-shaped backrest (8% wider internally than other models of the KIDFIX range) provides more space for your child's back and shoulders.
In addition, as it is tilting, the backrest automatically adjusts to match the angle of the car seat, providing a better fit and a comfortable position for the child.

KIDFIX III S - Respaldo

Installation with Isofix or seat belt

The KIDFIX III S offers two installation options:
- Isofix and 3-point seat belt (consult the list of approved vehicles).
- 3-point vehicle seat belt (universal approval)

Safe and Elegant

The KIDFIX III S is based on the KIDFIX III M, which obtained in the German automobile club ADAC’s latest car seat tests (also published by the RACE) the best score achieved by a group 2/3 highback booster (or its equivalent in the R129 or i-Size regulation) since 2015, the year when the test protocol changed, excelling especially in safety.

With its new modern design and black shell the KIDFIX III S looks superb in any car. In addition, the stylish cover gives the seat a sporty look and adds the finishing touch. Completely designed, developed and manufactured in Germany, KIDFIX III S ensures your child will travel not only safely, but also in style.


Removable Cover

It is easy for the car seat to get messy: a drink can spill or the child may get car sick. That's why we have designed a seat cover that can easily be removed and machine washed.

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Product Specifications

Dimensions: 67-84 x 54 x 43 cm (height x width x depth)
Weight: 8 kg
Approval: UN R44/04

KIDFIX III S - Dimensiones

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