Britax RömerAdvansafix i-Size

i-Size toddler to child

£265Typical price

Test score

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The Britax Romer Advansafix i-Size has been designed to last your child a long time – from when they measure 76cm (15 months) until 150cm (12 years). As the name suggests, it’s approved to the new R129 car seat regulations, but does it provide adequate protection in our tough crash tests? And what’s it like for the average parent to get their child installed in it? Read our full review of this child car seat to find out.

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cons

What's included?

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

Full Access first month £5, then £10.99 per month, cancel at any time

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

Aug 2023Last checked by Which?
Oct 2020First reviewed by Which?
Jan 2019Released

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

How we test baby and child car seats

3 Jan 2024

Safety rating

Overall
Forward-facing i-Size (Isofix)

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	76cm-150cm
Seat size	i-Size toddler to child
Age group	Multi-group
Direction of travel	Forward facing
Harness or shield seat	Harness
How is the child held in the seat?	5 point harness and adult seat belt
Manufacturer URL	https://www.britax-romer.co.uk/

Features
Adult seat belt	Yes
Isofix integrated into seat	Yes
Isofix base	No
Belted base	No
Type of Isofix	Base with Isofix connectors and top tether
Weight of seat (kg)	11kg
Weight of base (kg)	0kg
Harness height adjustment	Moves with headrest
Recline	Yes
Adjustable headrest	Yes

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How we test baby and child car seats
We crash-test every baby, toddler and child car seat we review to reveal which ones give the best protection in a crash, and which you should avoid
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Britax RömerAdvansafix i-Size