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The DUALFIX M i-SIZE is a flexible follow-on seat to any infant carrier – suitable for children from 61 to 105cm tall. Thanks to the 360-degree rotation on the integrated ISOFIX base, the seat can be used rear- and forward-facing. Plus, if you turn the seat 90 degrees to the open car door, positioning and harnessing your child is a breeze!

While an infant carrier is a lightweight and portable option for the first months of your child’s life, as they grow you may prefer to use a car seat that remains in the car. That’s when you will appreciate the ease and convenience of a spin seat! The DUALFIX M i-SIZE also offers 12 recline positions – rearward and forward-facing – and an adjustable rebound bar for ultimate comfort up to 4 years.

As we would expect from a brand with the history, track record and reputation of Britax Rӧmer, the DUALFIX M i-SIZE has been equipped with a large number of innovative safety features. There’s the optimised side impact protection SICT inside, implemented by a special steel element in the seat. And the patented Pivot Link ISOFIX System, which – should the worst happen and you suffer a collision – directs the force of the impact first downward, into the vehicle seat, and then forward, more gently – greatly reducing the risk of head and neck injury for your child.

Rearward facing car seats offer the best protection in the event of a frontal collision – the most frequent type of accident on the roads. In a frontal collision with a rearward facing seat the crash forces are directed to the back of the seat, while the remaining energy is spread evenly across the head, neck and upper body. With a forward facing seat the energy of the impact is distributed differently across the seat structure and restraint system – potentially resulting in more energy impacting on the child’s body. The DUALFIX M i-SIZE allows your child to travel rear-facing right up to 105cm or around 4 years old.

Deep, protective side wings, a specially designed V-shaped headrest and soft neoprene performance chest pads all add to your little passenger’s comfort and safety, while the quick-remove cover makes life easier for you when the inevitable leaks and spills happen!

The Britax Rӧmer DUALFIX M i-SIZE is made in Germany.

The current safety guidelines advise that newborn babies are not left in their car seat for longer than 30 minutes. For babies 2-6 months, no longer than 2 hours. It is also safer to keep your child rear-facing for as long as possible –  a minimum of 15 months but ideally 4 years. A child should never be in their harnessed car seat with a thick winter coat or snowsuit on. 

Weight 15 kg
Dimensions 74 × 44 × 48 cm







2 yrs

Age (min)


Age (max)

4 yrs

Car Seat Child height (min)


Car Seat Child height (max)


Weight capacity (max)


Car Seat Regulation


Car Seat Direction

Forward-facing, Rear-facing, Swivel

Car Seat max rear facing weight


Car Seat Vehicle Attachment


Car Seat ADAC rating


Car Seat Features

Extended-rear-facing, Multi-stage

Car Seat ADAC score


Car Seat Type

Baby-car-seat, Toddler-car-seat

Suitable for

3mths-4 yrs, Up to 18kg, 61-105cm


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