Booster Car Seat
Booster Car Seat
Booster Car Seat
Booster Car Seat
Booster Car Seat
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Diono Radian 3 R All-in-One Convertible +Booster Child Safety Car Seat


2020 Diono Radian 3 R Latch All-in-One Convertible + Booster Child Safety Car Seat

The original All-in-One convertible car seat is designed to fit 3 across and with our famous steel core inside for optimum safety. The new radian® 3R 2020 model now includes rear-facing for even longer (up to 50 lbs / 22.7 kg) and suitable from birth up to 120 lbs / 54 kg, expect 10 years of safety from just one car seat.

The Diono Radian 3R surrounds your child in protective materials, giving you peace of mind wherever life takes you on the special journey that is parenthood. It is lovingly engineered using automotive grade, super strength steel for safety you can feel. It is created to provide superior comfort, whenever you’re traveling and wherever you’re headed.

The unique Radian 3 collection fits 3 across in most vehicles, so you can transport the whole family in safety and comfort. With extended rear-facing, or in forward-facing position, it’s designed to meet your family’s growing needs, today, tomorrow and beyond. Plus our SuperLATCH ™ system makes installations easy and super secure. 

Installation Tips

read the manual the comes with your car seat
read the vehicle manual
find a certified child passenger safety instructor or technician to help you and check your installations

Airline Use

unfold the Diono car seat before boarding the plane and ask the flight attendant for seatbelt extenders
make sure to install the car seat next to the window so passengers can get by in case of an emergency
make sure to take the slack out of the seatbelt extender before connecting to the airplane seatbelt

Rear-Facing Installation

first secure the detachable base and slide in the locking mechanism
adjust the harness to be the proper height for rear facing
adjust the head support to fit your child properly

Folding & Unfolding

to unfold: lay the car seat down on a stable flat surface and undo the velcro strap, tuck it in behind the fabric and open seat until clicked and locked.
to fold: remove the red velcro strap from behind the fabric and loosen up the harness as much as possible so they are at the top of the car seat. release the lever at the bottom of the car seat and push seat inward - secure the top with the red velcro strap.

Right for Newborn?

whether you buy an infant only car seat or an all-in-one convertible car seat, both car seats have to meet the same standard
seats like the Diono all-in-one convertible car seats come with an infant cushion insert (radian® 3R not included) to properly fit your child in the harness
all-in-one convertibles are more economical - they have a lot of room for growth for your growing child


The Original 3 Across:

Features a slimline, space saving design at only 17'' wide, that allows you to install three across in most vehicles.

Diono Steel Core:

Our high-strength core has inherent integrity and forms and unyielding structure to shield and protect your little one.

Rear-facing for longer:

With extended rear-facing from birth up 50 lbs / 22.7 kg to keep your child in the safest position for as long as possible.

Easy Remove Covers:

When the next journey gets messy, easily remove the cover to machine wash and dry. 


Worth the weight:

Engineered with the famous Diono full steel core for safety you can feel. This high-strength core has inherent integrity and forms an unyielding structure to shield and protect your little one.

Extended rear-facing:

With extended rear-facing from birth to 40lbs /18 kg to keep your little ones in the safest travel position for as long as possible.

Long service:

With up to 10 years of service, this seat is built from high quality materials for durability. With a large seat capacity for growing children, the Radian 3 will become part of the family


Ergonomically designed with contoured shapes and layers of luxurious cushioning, ensure a comfortable environment, with plenty of room for shoulders, hips and legs.

Side impact protection:

Protective side walls are made from reinforced aluminium and covered in thick energy absorbing foam.


Our SuperLATCH system makes installation easy and super secure. An audible click lets you know when connectors are locked in safe.

Trend led design:

With designs inspired by the latest European fashions, great looks are combined with practicality. The stylish covers are made from durable, machine washable fabrics

Flat fold:

Super portable and folds flat for easy travel and transporting. A carry strap is also available.

You’re in good company:

Isn’t it great to know that the Radian collection has already been the choice of millions of parents worldwide.

Rear-facing for longer:

Now up to 50 lbs / 22.7 kg  

Extended lifespan:

Now suitable from birth up to 120 lbs / 54 kg

Improved fabrics:

New and updated fabrics that are easy to remove and wash. 


Rear-facing – 5-40 lbs / 2.3-18 kg
Forward-facing – 20-65 lbs / 10-29.5 kg
Booster mode – 50-100 lbs / 23-45 kg
Seated height – 8.25-17” / 21-43.2 cm
Overall maximum height up to 57” / 144.8 cm
Open:Height – 28.5” / 72.4 cm
Width – 17” / 43.2 cm
Depth – 16” / 40.6 cm
Folded:Height – 28.5” / 72.4 cm
Width – 17” / 43.2 cm
Depth – 7” / 17.8 cm
Net weight 26.12lbs / 11.85 kg
Color: Blue, Purple, White
Size: 20, 24
Material: 100% Polyester