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Britax Kidfix i-Size


The new generation KIDFIX i-SIZE has been developed in partnership with leading car manufacturers, to protect children from around 4 years, right up to the age of 12. Approved to the latest i-Size regulation, it offers safety you can trust, and maximum comfort. Its slim frame will fit a wide range of cars, making it the ideal choice for your growing family’s needs. It’s equipped with the proven technologies of XP-PAD and SecureGuard for frontal impact protection, whilst the new design SICT protects your child from side collisions. Carefully placed air ventilation holes aid air circulation to keep your child comfortable for longer.

* Safest KIDFIX to date during internal tests, Britax Römer 2021

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Expert protection

The new KIDFIX i-SIZE has been designed and approved to the new i-Size standard, making it our safest KIDFIX* to date. Every feature on the seat has been developed with one thing in mind – maximum protection. The proven technologies of XP-PAD, SICT (advanced side impact protection) and SecureGuard, now combined with the redesigned seating area for optimum crash performance, offer all-round protection.

* Safest KIDFIX to date during internal tests, Britax Römer 2021

The XP-PAD (shock-absorbing foam pad), prevents the impact of your child’s chin on their chest, absorbing up to 30%  of the energy. A sudden forward head movement is reduced and the neck is protected. At the same time it provides additional padding around the edges of the seat belt.

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.


Comfort and practicality at its core

Comfort and practicality come as standard with the KIDFIX i-SIZE. The generously padded soft fabric covers and carefully placed air ventilation holes on the shell ensure your child travels in comfort for longer. The slim design of the seat allows for three KIDFIX i-SIZE seats to be installed in the back row of a wide range of cars, whilst the headrest markings help the parents find the right headrest height every single time.



Protecting what matters most: Our mission is to provide safe, comfortable, sustainable and easy to use child mobility solutions. But just like we care for children and their safety around the globe, we very much care for the world they grow up in, taking multiple steps into a more sustainable future. The KIDFIX i-SIZE, our first 100% carbon neutral product, is the perfect choice keeping safety you can trust as well as sustainability in mind.


Carbon Neutral, GREEN SENSE & Made in Germany

We have calculated the product carbon footprint (cradle to (customer) gate) for the KIDFIX i-SIZE together with our partner TÜV Rheinland: ca. 19 kg CO2e. We continuously work to further reduce it keeping in mind that certain materials are needed to focus on the main purpose: transporting kids safely. Besides being carbon neutral, the KIDFIX i-SIZE is also Made in Germany and is packed in plant-based bags as well as recycled cartons from responsible sources. It is available in three stylish GREEN SENSE fashions, the fabric covers of this collection are made from 100% recycled PET plastic bottles.

Britax-Römer are excited to announce that our KIDFIX i-SIZE is the winner of the latest ADAC crash-tests with the score of 1.8 in the 100 – 150 cm category! ADAC describes the KIDFIX i-SIZE as “the best car seat for big kids”. The results are made up of the following factors:

safety, handling, comfort, and hazardous substances.

The ADAC test result is a score out of 5. The closer that mark is to 0, the better the score. All aspects of the car seat are tested: its safety in case of frontal or lateral impact, its ease of use, the comfort of the child and whether harmful substances are present in the car seat.

‘The strengths of KIDFIX i-SIZE include low risk in injury in frontal impact, very low risk of injury in a side impact, very little harmful substances, stable installation, and easy installation with low risk of misuse. KIDFIX i-SIZE is also lightweight and comfortable for both children and adults to use. Britax Römer has once again proven its capability to develop and produce some of the safest and most user-friendly car seats. The result specifically shows that the seat has been developed with safety in mind.


Forward facing from 100 – 150 cm (suitable approximately from 4-12 years old)
Isofix or seatbelt installation
Meets R129 regulations
Dimensions (H x W x D): 63 – 83 x 48 x 42 cm
Weight  6.7 kg
Britax Kidfix isize

Cosmos Black, Golden Cognac


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