Joiei-Gemm 3 (belted)

i-Size baby
Seat belt

£160Typical price

Test score

Sign up to unlock the full expert review

Joie claims its i-Gemm 3 infant carrier offers superior safety, highlighting a 'Tri-Protect' headrest built with three internal layers of defence. To see if these side-wings actually hold up under pressure, we subject every seat to our own severe side-impact crash simulations, along with extensive everyday useability assessments. Should this model make your baby gear shortlist? Discover the verdict in our full review.

pros

Content has been blurred out, please log in to view.

cons

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?

Get Digital access at £9.99 a month, cancel at any time.

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

Oct 2026First reviewed by Which?
May 2026Released

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

6 Oct 2026

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	40cm-85cm
Seat size	i-Size baby
Age group	Baby
Direction of travel	Rearward facing
Extended rear-facing seat	No
Installation type	Seat belt
Harness or shield seat	Harness
How is the child held in the seat?	3 point harness
Manufacturer URL	https://joiebaby.com/uk/

Features
Adult seat belt	Yes
Isofix integrated into seat	No
Isofix base	Yes
Belted base	No
Swivel seat	Yes
Weight of seat (kg)	4.56kg
Part of a travel system?	Yes
Harness height adjustment	Moves with headrest
Adjustable headrest	Yes

Suggested Alternatives

Joie

Sprint

i-Size baby
Isofix connectors (plus base if wanted)

£149View retailers

Test score

Maxi Cosi

CabrioFix i-Size (belted)

i-Size baby
Isofix and belt installation possible

£129.99View retailers

Test score

Graco

Snugessentials + Isofamily i-Size base

i-Size baby
Belted and isofix base possible

£153.95View retailers

Test score

Best baby or child car seats 2026
We reveal the best car seats for newborns, toddlers and children, based on our tough lab tests, plus expert buying advice on types and jargon
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, and which you should avoid
Car seat weight groups and height groups explained
We explain how to choose a car seat that fits your child, whether it's a newer i-Size car seat or an older group 0+, 1, 2 or 3 car seat

All child car seat advice

Joiei-Gemm 3 (belted)