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

  • Sale
  • Regular price $299.99

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

Say hello to our flagship product chosen by Over a million parents to protect their little ones. Lovingly engineered with a full steel frame.

Enjoy the journey with our Diono Radian 3RXT all-in-one convertible car seat, lovingly engineered to always overprotect. Your child’s safety is our top priority, with premium, innovative features the Diono Radian 3RXT is sleek and stylish with all the practicalities that you could possibly need like a steel alloy frame, aluminum reinforced side walls, energy absorbing EPS foam, and memory foam to put your mind at ease as your little one travels safely in style and comfort. The reinforced adjustable head support provides additional side impact protection. And, if you want to avoid those bulky car seats, look no further as the sleek design of the Diono Radian 3RXT allows for a 3 across fit or plenty of room for passengers.

Super Side Impact

Extra-deep, aluminum reinforced sidewalls that extend straight forward and are lined with thick, impact energy absorbing foam.

Extending Headrest

Twelve positions adjustable head support, reinforced for enhanced side impact safety.

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).

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 3 rxt 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. We shield your precious child through Super side impact protection with aluminum reinforcement.

 Three’s not a crowd:

For safety that fits 3 across the radian 3 rxt 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 3 rxt has soft fabric covers and a memory foam seat base bottom. Lined with thick 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 rxt. It folds flat, so you can travel the world and is FAA approved for use on an aircraft. You don’t need to change just because the baby is in tow.


Designed to provide outstanding safety, comfort and convenience features for your growing child from rear-facing infancy to forward-facing toddlerhood to the cusp of 120 lb. in booster mode
Safely seat children 5-45 lb. in the rear-facing car seat mode
Safely seat children 20-65 lb. in the forward facing car seat mode
Safely seats children 50-120 lb. in the booster mode; or up to 57" H
5-point adjustable harness with 5 shoulders and 3 buckle positions for a secure fit
12-position adjustable headrest
Infant body support cushions and memory foam adds comfort
Rubber bottom grips for non-slip installation Sits low on a vehicle seat for easy child boarding
Expandable sides and longer seat bottom offers proper leg support and comfort
Fits 3 across in a mid-size vehicle and offers more shoulder space
Safe Stop energy absorbing harness
Steel alloy frame and aluminum reinforced sides for strength and safety
Thick EPS energy absorbing foam panels provide side impact protection
LATCH compatible
SuperLATCH system makes installation quick and easy
Shoulder and lap belt guides
Rear-facing tether capability
Folds flat for travel and is
FAA certified for easy storage and portability when traveling
Angled cup holder keeps drinks upright and within easy reach
Machine washable cover


Rear-facing – 5-45 lbs / 2.3-20.4 kg
Forward-facing – 20-65 lbs / 9.1-29.5 kg
Booster mode – 50-120 lbs / 22.7-54.4 kg
Seated height – 8.25-17” / 21-43.2 cm
Overall maximum height up to 57” / 144.8 cm


Height – 28.5” / 72.4 cm
Width – 17” / 43.2 cm
Depth – 16” / 40.6 cm


Height – 28.5” / 72.4 cm
Width – 17” / 43.2 cm
Depth – 10” / 25.4 cm
Net weight 27.68 lbs / 12.55 kg