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Britax RömerDualfix M Plus

i-Size baby to toddler
Isofix installation only
Extended rear-facing seat

£177.99View retailers

Test score

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The Britax Romer Dualfix M Plus offers up the convenience of a 360-degree rotating car seat with the added safety benefits of an extended rearward-facing seat. But will this seat also be straightforward to install and comfortable for your child? Read our review to find out.

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What's included?

What is it?
How safe is it?
Is it easy to fit?
Is the seat comfortable?
Is there anything else I should know?
Should I buy it?
Where can I buy it?

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KEY TEST RESULTS
Safety rating
Fitting in car
Comfort of your child

May 2023First reviewed by Which?
Dec 2022Released

The overall Which? test score is made up of the following star ratings, all determined by our rigorous lab tests.

Two child safety seats in the back of an orange van, each holding a crash test dummy with green heads.

How we test baby and child car seats

22 Oct 2025

Safety rating

How we test safety rating

The overall safety score is made up of the results of crash testing (front crash; side crash) seat design, stability in the car and belt routing. Our crash tests go beyond the legal minimum requirements for UK car seat regulations and are conducted at higher speeds and forces than the regulations require. We feel our tests more accurately reflect what could happen in a real life crash.

Fitting in car

Overall
Buckling up
Avoiding misuse and instructions
Cleaning
Space required in car

How we test fitting in car

Fitting and using includes: How easy it is to install the seat correctly in the car. How easy it is to strap a child securely into the seat. How well the seat is designed in order to prevent incorrect use. How easy the seat cover is to remove and wash. How little space the seat takes up in the car and how comfortable your child is in the seat.

Ergonomics

Overall
Comfort of your child

How we test ergonomics

Our experts conduct an ergonomic assessment of each seat to make sure your child will be in the best position when travelling, along with the level of padding and support. Our tests also reveal how much space this car seat takes up in the back seat of a car and how easy it is to get your child in and out of the seat. Plus, our eagle-eyed car seat experts will check whether this seat affects how much space any front passengers have. This assessment was introduced to our site in May 2015. If a seat does not have this score, it was tested before May 2015.

General
Height of child	61cm-105cm
Seat size	i-Size baby to toddler
Age group	Baby to toddler
Direction of travel	Reversible
Extended rear-facing seat	Yes
Installation type	Isofix installation only
Harness or shield seat	Harness
How is the child held in the seat?	5 point harness
Manufacturer URL	https://www.britax-romer.co.uk/

Features
Adult seat belt	No
Isofix integrated into seat	Yes
Isofix base	No
Belted base	No
Type of Isofix	Isofix connectors and support leg
Swivel seat	Yes
Weight of seat (kg)	12.2kg
Part of a travel system?	No
Harness height adjustment	Moves with headrest
Recline	Yes
Adjustable headrest	Yes

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