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

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

Family life can be hectic, but it doesn’t need to be difficult. Our radian 3RX has been designed to fit your lifestyle. The unique superlatchtm system makes

installation quick and easy

Here at Diono, we understand what family life is all about, that’s why we have thoughtfully designed our products with that in mind. The Radian 3RX is lovingly engineered with a full steel frame and aluminum reinforced sides to maximize protection. The unique SuperLatch system makes installation quick and easy and the memory foam cushioning, padded harness and specifically angled cup holder help to keep your little one happy on life’s short or long journeys. Our low profile sides make life easy for you to board your child in the seat. Safety and functionality are always at the forefront of what we do; making sure that your little one will remain secure, comfortable and happy wherever life takes you.

Your child’s security is our top priority. We engineered our radian 3RX with premium, innovative features like a steel alloy frame, aluminum reinforced sidewalls, energy absorbing EPS foam and reinforced adjustable head support to keep your little one protected and comfortable.

The joy of the journey:

From birth, keep your little one rear-facing longer to 45 lbs, traveling safely. As they grow to 120 lbs (12 years approx.) our long-range lifespan protects your child facing forwards. Peace of mind for you, we’ve thought of everything so you don’t have to.

Lovingly engineered:

The radian 3RX is fabricated using super strong automotive high strength steel, engineered into a dual spine. This unique core manages and dissipates energy and provides an unyielding structure to protect your baby. Our audible click SuperLatch system makes installation easy and quick.

 Three’s Not a crowd:

For safety that fits 3 across the radian 3R packs all our innovative safety features into a sleek and slim design that allows you to fit three across (in most mid-size vehicles). Now the whole family can travel, together.

Business Class comfort:

Inspired by the best European fashions, our radian 3RX has bright soft fabric covers and a memory foam seat bottom. Lined with energy-absorbing foam, comfort and safety go hand in hand. A tailored infant support cushion and a cup holder are included.

Made of Seattle:

We are from Seattle, a city where being different is the norm and so is the radian 3 Rx. It folds flat, so you can travel the world and is FAA approved for use on an aircraft. You don’t need to change your plans just because the baby is in tow.

Three’s Not a Crowd

Some say three’s a crowd. We say, the more the merrier! Our Radian 3RX car seats fit 3 across in most mid-size vehicles or larger.

Worth The Weight

Radian 3RX is engineered with premium innovative features like a steel alloy frame for safety you can feel. That’s why it has already been chosen by millions of parents to protect their little ones.

Easy Installation

Our unique Superlatchtm system makes installation easy and secure.

Travel The World

Super portable, folds flat with available carry straps for easy travel and transporting with ease.

Infant Insert And Cupholder

Nested infant inserts in superior fabrics with room for two cup holders to hold drinks and snacks (comes with 1 cup holder).


Extended rear-facing

The radian 3rx keeps children comfortably rear-facing from 5-45 pounds for the safest possible position. Premium, plush head and body support cushions are included for newborns and infants.

Room to grow

Accommodates forward-facing children up to 65 pounds in a 5-point harness and converts to booster mode for kids 50-120 pounds. The aluminum reinforced, adjustable head support and sidewalls provide additional side impact protection.

Worth the Weight

Our convertible car seats are made from steel for safety you can feel. The fully integrated steel frame is wrapped in thick engineered plastic to withstand severe crash forces. Deep, aluminum reinforced sidewalls provide excellent side impact protection, while energy absorbing Eps foam surrounds your child for ultimate safety. Diono car seats are definitely worth the weight.

SuperLatch Installation

Our unique Super Latch system makes installation easy and secure. An audible click and visual indicator let you know when the connectors are locked.  

Side Impact Protection

We’ve got your child’s safety covered. Radian 3 RX seats feature deep, aluminum reinforced sidewalls that extend straight forward and are lined with thick, energy-absorbing foam. We performed rigorous side impact testing to achieve the proper size, shape, and strength that best protects children from side impact forces.

Safe Stop

Our patented Safe Stop harness component is a load-limiting device that absorbs energy in a crash. The unique design offers an additional layer of protection by reducing the impact to a smaller, forward-facing child.

Rear-Facing Tether

As for safety experts, we think of every precaution. Rear-facing tether capability helps reduce seat rotation during an impact. This unique feature is not found on every car seat. We built it in here for an extra layer of protection when your child is rear-facing. 


5-40 lbs / 2.3-18.1 kg

20-65 lbs / 9.1-29.5 kg

Booster mode
50-120 lbs / 22.7-45.4 kg

Seated torso height
8.25-17″ / 21-43.2 cm

Overall maximum height
up to 57″ / 144.8 cm

Color: Blue, Purple, White
Size: 20, 24
Material: 100% Polyester