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radian® 3RXT luxe

the luxury 3 across All-in-One car seat

radian® 3RXT luxe

The Diono Radian 3RXT luxe features exclusive diono fabrics and coordinating back seat organizer for ultimate in-car luxury from birth to booster (5 – 120 lb / 2.3 – 54 kg). 

Lovingly engineered with the famous Diono Steel Core and now rear-facing for even longer, expect 10 years of safety from just one car seat.



What makes radian® 3RXT luxe great?


The radian 3RXT luxe All-in-One car seat is crafted with striking Black Platinum and Black Camo finishes designed to take pride of place in any vehicle. The luxe collection features premium quality fabrics and considered detailing that is new and exclusive to the 2020 Radian R Series.


The radian 3RXT luxe All-in-One car seat includes a handy back seat organizer with 6 storage pockets and 2 drinks holders so you can keep their road trip essentials close by. 



Features newborn travel high wedge to create a lie-flat travel position. Then as your baby grows, simply remove the wedge to allow the 2-in-1 infant positioning line to give a cozy, comforting support. 


With 4 ways to travel from birth to booster, the radian® 3RXT adapts as your child grows to offer a custom fit from birth up to 120lb / 54kg.


Built with our famous radian® slim fit design, to fit 3 across in most vehicles without compromising child or passenger comfort.


Designed and engineered to keep your child rear facing for even longer up to 50 lb / 22.7kg (approx. 4 years old).



5-50 lbs / 2.3-22.7 kg 


22-65 lbs / 10-29.5 kg 

Booster mode

40-120 lbs / 18-54 kg 

Seated torso height

7.5-16.5″ / 19-42 cm 

Overall maximum height

up to 57″ / 144.8 cm 

Key product features and benefits

Steel Core
Mechanically engineered, reinforced steel core. Made from automotive grade high strength steel. What better way to protect your child?

2-in-1 newborn protection
The removable infant insert features newborn travel high wedge to create a lie-flat travel position. Then as your baby grows, simply remove the wedge to allow the 2-in-1 infant positioning liner to give cozy, comforting support.

Safety from all angles with side impact position … 
Aluminium reinforced sides and thick energy absorbing foam distributes crash forces.

Includes Back Seat Organizer

With 6 storage pockets and 2 drinks holders to keep all their road trip essentials close by!

12 position adjustable headrest
radian 3RXT features an aluminium reinfornced headrest, that can be adjusted to one of 12 positions to protect up to 57″ / 145 cm tall. 

Easy remove covers
Radian 3RXT features easy remove covers. So when the next journey gets messy, easily remove to machine wash.

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

2-in-1 infant positioning liner
2-in-1 infant positioning liner with integrated newborn travel high wedge. As your baby grows, simply remove the wedge to allow the 2-in-1 infant positioning liner to give extra comfort and infant support.

what’s the difference? 

Additional 2 year warranty*

Receive an additional 2-years warranty on all car seats and strollers purchased from *T&C’s apply

FREE Shipping on orders over $200*

Diono proudly offers free shipping on orders over $200. *T&C’s apply

Join the Very Important Passenger Club

Unlock exclusive news, offers and discounts on all products.

1-2-1 Virtual Car Seat Fitting

Book a 1-2-1 virtual car seat fitting with a member of our car seat safety team


can the radian 3RXT fit-across in my car?

Most likely, yes, as long as you have 54” (137cm) in the back row from vehicle armrest to armrest. It may be necessary to install all three using the vehicle seat belt system.

can the harness straps be cleaned?

Yes, we recommend using a damp cloth with a solution of water and baking soda to wipe the straps clean. They cannot be saturated in any liquid, or they will need to be replaced. Replacement harness straps can be purchased on our website.

can I use the radian 3RXT from birth?

Yes, the weight limits on all our convertible car seats starts at 5lbs. The newborn must also meet a length requirement where the top of their shoulders reaches the lowest harness slot on the seat.