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Diono 2019 Radian 3RXT, 4-in-1 Convertible Car Seat, Rear and Forward Facing, Steel Core, 10 Years 1 Car Seat, Ultimate Safety and Protection, Slim Fit 3 Across, Gray Oyster

4.7 4.7 out of 5 stars 277 ratings

Currently unavailable.
We don't know when or if this item will be back in stock.
Brand Diono
Installation Type Latch
Material Steel, fabric, foam, plush
Color Gray Oyster
Orientation Convertible Seat, Rear Facing

About this item

  • JOY OF THE JOURNEY: From birth, keep your little one rear-facing longer to 40 lbs., and as they grow to 100 lbs. (10 years approx.) our long-range lifespan protects your child facing-forward.
  • THREES NOT A CROWD: For safety that fits 3 across the Radian 3RXT 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
  • LOVINGLY ENGINEERED: The Radian 3RXT is built with automotive-strength steel, engineered into a dual spine, which manages and dissipates energy with an unyielding structure to protect your baby. Our audible click SuperLATCH system makes installation easy.
  • BUSINESS CLASS COMFORT: Inspired by the best in European style, our Radian 3RXT has bright soft fabric covers, and a memory foam seat bottom. Lined with energy absorbing foam, comfort and safety go hand in hand
  • MADE OF SEATTLE: We are from Seattle, a city where being different is the norm and so is the Radian 3RXT. It folds flat, so you can travel the world and is FAA approved for use on an aircraft, so you can take safety with you wherever you go. Care & maintenance : Cover machine washable at 86F/30C/Cold
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From the manufacturer

Radian 3RXT

What makes Radian 3RXT great?

Adjust As Your Child Grows

The original 3 across

Unique Nesting Principle

Adjust As Your Child Grows

Diono car seats are built from high quality materials for durability so the Radian 3RXT will become part of the family.

The original 3 across

Radian 3’s clever design has a slimline profile that allows you to install three across in your vehicle without compromising on the roomy internal seat dimensions.

Unique Nesting Principle

The 3RXT includes the original Diono nesting insert. A soft infant liner to keep your little baby both secure and cozy. Then as your little one grows, simply remove the liner.

The Diono difference built into every Radian

Hand-built from reinforced steel...

Extended Rear-facing

Safety from all angles with side impact protection...

Hand-built from reinforced steel...

Our automotive grade steel core at the heart the Diono convertible car seat range, designed and built without compromise. What better way to protect your child?

Extended Rear-facing

Our range of all-in-one convertible car seats are hand-built with extended ear-facing capabilities, allowing you to keep your little one rear-facing for as long as possible.

Safety from all angles with side impact protection...

All our seats go through rigorous testing protocol that simulate side impact crashes. The seats are then evaluated based on how well they contain the head, while reducing chest and pelvis acceleration.

We've thought of everything…

Travel ready

SuperLATCH installation

Build your back seat

Travel ready

Radian car seats are super portable and fold flat for easy travel. They are also FAA Approved and certified for use on aircraft!*

*FMVSS213 Aircraft Inversion Report by Carlspan, Buffalo, NY and SGS Guangzhou, Guangzhou, China. 5/16/18.

SuperLATCH installation

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

Build your back seat

At Diono, we understand growing families need tailormade solutions. With our colorful range of all-in-one convertible car seats you can build your back seat in safety and style.

Radian 3R Radian 3RX Radian 3RXT Rainier 2 AX Rainier 2 AXT
Radian 3R Radian 3RX Radian 3RXT Rainier 2AX Rainier 2AXT
Customer Reviews
4.6 out of 5 stars
275
4.3 out of 5 stars
83
4.5 out of 5 stars
130
4.3 out of 5 stars
39
Rear Facing with lap/lap shoulder belt up to 40 lbs 45 lbs 45 lbs 50 lbs 50 lbs
Forward-facing with 5-point harness lap/lap and shoulder belt up to 65 lbs 65 lbs 65 lbs 65 lbs 65 lbs
Forward-facing booster mode up to 100 lbs 120 lbs 120 lbs 120 lbs 120 lbs
Fits 3 across/side by side in most cars
Number of Available Colors 6 5 8 7 7
Seated Torso Height 8.25" - 17″ 8.25" - 17″ 8.25" - 17″ 8.25" - 17″ 8.25" - 17″

Product Description

Life is complicated enough, and that’s why here at Diono we carefully craft our products to be intuitive and as easy to use as possible while providing the optimum level of safety and security for your little ones. Trusted by over a million parents, the Diono Radian 3RXT is our flagship all-in-one convertible car seat, designed to fit 3 across, without sacrificing safety or passenger comfort. We have spent years perfecting protection to help parents keep their children traveling the safest way, for as long as possible – our Radian series is lovingly engineered with the famous Diono Steel Core that provides an unyielding structure to protect and shield, and extended rear-facing capabilities, so you can expect 10 years of safety from just one car seat. Our unique SuperLATCH system makes installation easy and secure with an audible “click”. The Diono Radian 3RXT surrounds your child in overprotective, strong materials giving you peace of mind wherever life takes you (including in the air: the Radian 3RXT is aircraft certified / FAA approved), so you can take safety with you wherever you go. We’ve thought of everything, so you don’t have to.

Product information

Technical Details

Additional Information

Warranty & Support

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Diono 2019 Radian 3RXT, 4-in-1 Convertible Car Seat, Rear and Forward Facing, Steel Core, 10 Years 1 Car Seat, Ultimate Safety and Protection, Slim Fit 3 Across, Gray Oyster

Diono 2019 Radian 3RXT, 4-in-1 Convertible Car Seat, Rear and Forward Facing, Steel Core, 10 Years 1 Car Seat, Ultimate Safety and Protection, Slim Fit 3 Across, Gray Oyster


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Diono 2019 Radian 3RXT, 4-in-1 Convertible Car Seat, Rear and Forward Facing, Steel Core, 10 Years 1 Car Seat, Ultimate Safety and Protection, Slim Fit 3 Across, Gray Oyster
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PriceCurrently unavailable.-15% $169.99
List:$199.99
$429.99$235.99-6% $149.99
List:$159.99
-8% $290.58
Typical:$315.37
Delivery
Get it as soon as Thursday, May 16
Get it as soon as Tuesday, May 14
Get it as soon as Thursday, May 16
Get it as soon as Thursday, May 16
Customer Ratings
Safety Features
4.8
4.5
4.5
Comfort
4.7
4.4
4.5
Easy to install
3.9
4.1
4.4
Sold By
Amazon.com
Spreetail
Spreetail
Amazon.com
Amazon.com
material
Steel, fabric, foam, plush
Alloy Steel, Plastic, Polypropylene, Polystyrene
Plastic, Alloy Steel, Aluminum, Polyethylene
Alloy Steel
min recommended weight
5 pounds
5 pounds
5 pounds
5 pounds
40 pounds
5 pounds
max. recommended weight
120 pounds
120 pounds
65.0 pounds, 50.0 pounds, 120.0 pounds
65.0 pounds, 50.0 pounds, 120.0 pounds
120 pounds
120 pounds
maximum height
57 inches
57 inches
28.5 inches
28.5 inches
63 inches
57.1 inches
minimum height
18.1 inches
38.2 inches
18.1 inches
rear-facing min. weight
5 pounds
5 pounds
5 pounds
5 pounds
5 pounds
max rear facing weight
45 pounds
50 pounds
50 pounds
max forward facing weight
120 pounds
120 pounds
120 pounds
120 pounds

Looking for specific info?

Customer reviews

4.7 out of 5 stars
4.7 out of 5
277 global ratings

Customers say

Customers like the appearance, safety, and fit of the infant toddler car seat. For example, they mention it's well-made, has a beautiful blue color, and fits in a car very well. That said, opinions are mixed on size, ease of installation, and weight.

AI-generated from the text of customer reviews

37 customers mention36 positive1 negative

Customers are satisfied with the quality of the infant toddler car seat. For example, they mention it's well-made, sturdy, and made of steel. Some say the installation was incredibly easy. Overall, most are happy with the product's quality and design.

"...the way back in the Camry for optimal legroom AND the car seat isn't crushed or compromised in the middle back! ORDER THE ANGLE ADJUSTER!..." Read more

"...fall forward since it is very vertical but actually inside is a nice recline and the harness holds them tighter than any of the other more spacey..." Read more

"...The seat is also heavier than I expected, but certainly well made...." Read more

"...I love the extended rear facing and the comfort and durability. This is the only car seat I’ll need till my kids no long longer need car seats...." Read more

32 customers mention28 positive4 negative

Customers like the fit of the infant toddler car seat. They say it's stylish, fits in a car very well, and is narrow yet safe. They also mention that it'll fit 3 across in s small car and that it is comfortable for their child.

"This is my 3rd high end car seat. all 3 fit easily and installation wasn't hard. People comment on them all the time and kids never had a complaint...." Read more

"Great looking and narrow seat. The low sides make it easier to place my daughter in the seat...." Read more

"This is a great car seat. I love the extended rear facing and the comfort and durability...." Read more

"...The material is great. The installation was incredibly easy. The size is great, not too wide, can fit 3 across...." Read more

9 customers mention9 positive0 negative

Customers appreciate the infant toddler car seat's appearance. They mention it's well-made, has a beautiful blue color, and that they value beauty over function.

"Great looking and narrow seat. The low sides make it easier to place my daughter in the seat...." Read more

"The Diono is beautiful, extremely rigid and looks like a fantastic option...." Read more

"...My daughter looks very comfortable and secure. It’s also a beautiful car seat! We got the lighter gray color...." Read more

"...The color is similar to the interior of my car so I really like that too." Read more

9 customers mention9 positive0 negative

Customers are satisfied with the safety of the infant toddler car seat. They mention that it is the best, safest, and most versatile. The seat has a very quality and safe feel to it, and it helps protect the actual car seat and is very comfortable and secure.

"...Not only does it help protect the actual car seat (we still have one of those seat protectors between), but it also helps keep in\hide all the extra..." Read more

"...My daughter looks very comfortable and secure. It’s also a beautiful car seat! We got the lighter gray color...." Read more

"...that my daughter is pretty comfortable in it and I feel like she is definitely safe...." Read more

"Such a great seat with a very quality and SAFE feel to it. Heavy as heck but we don’t plan to move it around much...." Read more

30 customers mention15 positive15 negative

Customers are mixed about the ease of installation. Some mention it's fairly easy to install, while others say it'll be difficult to install and make secure.

"This is my 3rd high end car seat. all 3 fit easily and installation wasn't hard. People comment on them all the time and kids never had a complaint...." Read more

"...The instruction book is bare-bones at best, but YouTube University has lots of car seat inspector videos to help you on your way...." Read more

"...They’re heavy but it is very do-able. Install easily on the airplane and in rental cars quickly once you’ve done it once or twice." Read more

"This car seat was highly recommended to me. It gets a little confusing for the install with the different weight requirements and use of anchors or..." Read more

11 customers mention5 positive6 negative

Customers are mixed about the weight of the infant toddler car seat. Some mention it's heavy but do-able, while others say that it'll be part of the safety.

"...They’re heavy but it is very do-able. Install easily on the airplane and in rental cars quickly once you’ve done it once or twice." Read more

"...The seat is also heavier than I expected, but certainly well made...." Read more

"...I will say I liked the construction and I also liked the weight of the item. Knowing it is a metal frame was good...." Read more

"...Great quality, well worth the price. Its heavy but that is part of the safety...." Read more

7 customers mention3 positive4 negative

Customers have mixed opinions about the size of the infant toddler car seat. Some mention that it's solid, comfortable, and can fit three in a row, while others say that it is so big and takes up a bit of space.

"...It does take up a bit of space from the back to front, and if it's rear-facing there's another pad that you should buy to help...." Read more

"...The size is great, not too wide, can fit 3 across.As our other car seat start to expire we will be purchasing more Diono seats." Read more

"...Two thumbs down! For rear facing, its small car feature is pointless without the additional $10 angle adjuster, which is useless for a newborn..." Read more

"Solid, comfortable, can fit three in a row in our outback (postpone buying a new car and spend $300 on a car seat, yes please!)...." Read more

7 customers mention3 positive4 negative

Customers are mixed about the value of the infant toddler car seat. Some mention that it's worth every penny, while others say that it is not cheap and made of potentially subpar steel.

"...Although these are not cheap, darned if they are not solid! (not to mention heavy)...." Read more

"...$10 for a seat adjuster is worth every penny in legroom and in not having to buy a new car or worry about replacing a car seat at a later date...." Read more

"...WTH?! Made of potentially subpar steel and the base is snap on plastic?!..." Read more

"...Great quality, well worth the price. Its heavy but that is part of the safety...." Read more

Way to tall/long won’t leave you any leg room
3 Stars
Way to tall/long won’t leave you any leg room
Love the car seats as a whole but they do not fit great in my Chevy Equinox rear facing. They are extremely tall/long and they are left resting on our seats and after adjusting our seats our legs are in the dash. Every time I try to find the insert that goes under it to help it’s sold out
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Top reviews from the United States

Reviewed in the United States on July 31, 2019
I am so excited that this seat fits that I had to write a review the same day I installed it. I was down to the wire choosing between this seat and a Safety 1st seat. Both Diono and Safety 1st put their seats through European standards of safety, which includes rating their safety in the event your car should roll. To me, that's a big deal! And you'd be surprised how many of the "safest" brands state-side don't uphold to European standards. Both Diono and Safety 1st performed well across the board in the US and in Europe for safety tests. At first, we went with Safety 1st because other reviewers had said it was wide but that the height would fit in a Toyota Camry and allow for legroom for the front seat. No such luck for us. I am 6' and my husband is 6'4". We need all the legroom we can get! This seat is more narrow than safety 1st but almost exactly the same height dimension. So was I a total shmuck in ordering the same height dimension and expecting a different result? Was I out of my mind delusional thinking that our too-tall child could have a tall car seat to grow with him/her and allow him/her to stay facing the back longer and more safely?? NO! The Diono fits!! I can move BOTH front seats all the way back in the Camry for optimal legroom AND the car seat isn't crushed or compromised in the middle back! ORDER THE ANGLE ADJUSTER! It really did give another 2-3" which allowed me to move the seats all the way back. $10 for a seat adjuster is worth every penny in legroom and in not having to buy a new car or worry about replacing a car seat at a later date. I have installed many a seat in my day, even though this is our first child. This is not a pull it out of the box and pop it in your car kind of seat. The instruction book is bare-bones at best, but YouTube University has lots of car seat inspector videos to help you on your way. I was able to install the seat safely at 38 weeks pregnant, so if I can do it with big belly and pregnancy brain, then so can you!
One person found this helpful
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Reviewed in the United States on April 7, 2020
This is my 3rd high end car seat. all 3 fit easily and installation wasn't hard. People comment on them all the time and kids never had a complaint. I was afraid that their head will fall forward since it is very vertical but actually inside is a nice recline and the harness holds them tighter than any of the other more spacey seats. I should have bought this first.
Oh, I fitted them into a Chevy Bolt. All three of them!!!!! no problem!
Reviewed in the United States on December 15, 2019
Great looking and narrow seat. The low sides make it easier to place my daughter in the seat. The seat is also heavier than I expected, but certainly well made. A notable detail is, when the seat is rear facing: there are two points at the base that wedge themselves in-between the seat and backrest. My rear seat has this devide slightly higher than the bottom of the backrest. This means that the points dig into the seat rather than sliding in. This makes a seat protector necessary. Something to consider.
One person found this helpful
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Reviewed in the United States on July 18, 2019
This is a great car seat. I love the extended rear facing and the comfort and durability. This is the only car seat I’ll need till my kids no long longer need car seats. We have used the backpack straps and carried these cross country a few times. They’re heavy but it is very do-able. Install easily on the airplane and in rental cars quickly once you’ve done it once or twice.
One person found this helpful
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Reviewed in the United States on August 28, 2020
This car seat was highly recommended to me. It gets a little confusing for the install with the different weight requirements and use of anchors or the seat belts. It does take up a bit of space from the back to front, and if it's rear-facing there's another pad that you should buy to help.

overall though I live in Arizona and these are supposed to be able to last the heat out here.
Reviewed in the United States on March 22, 2019
I wish we would have found this seat sooner. We are on child number 3 now and have already had to dispose of several car seats from kid number 1. The 10 year lifespan is huge in a carseat.

It is definitely a high end car seat. The material is great. The installation was incredibly easy. The size is great, not too wide, can fit 3 across.

As our other car seat start to expire we will be purchasing more Diono seats.
Reviewed in the United States on June 17, 2019
I never want my child to ride in any carseat but this one. Great quality, well worth the price. Its heavy but that is part of the safety. My daughter went from hating her previous infant carseat to loving the extra room of this one. It takes more time to.install but once its in, it is solid. I don't recommend travelling with it via air, due to the extra pounds the baggage personnel were not kind to ours, its awkward to carry and move around.
Reviewed in the United States on April 6, 2019
When our LO was a baby and we were outgrowing the initial Convertable Car Seat (the ones that go between the docking station and the stroller), we researched the heck out of car seats. We wanted something that was the best, safest, and most versatile. Although these are not cheap, darned if they are not solid! (not to mention heavy).

So our first one we had for 3-4 years and then we got rear ended. Replacing the baby seat was a must (No injuries to the kid), so we didn't give it a second thought and went straight back to Amazon and got the Radian again.

Two years later, we got rear-ended again (both times sitting at a light and the person behind us was flipping blind). Again, a no brainer (and kid had no injuries). Of course by now, The Radian has gone to a newer version called the 3RXT but it is basically the same.

One thing that I really like about this newer version is the full cover. I hate that all these car seats pad the front for the kiddo, but could care less about the damage they cause to your car seat. This new Radian has a full cover that goes over the back. Not only does it help protect the actual car seat (we still have one of those seat protectors between), but it also helps keep in\hide all the extra hardware.

Hopefully this one will take us all the way through the booster years, but if bad luck continues to follow us.. another Radian it will be!
2 people found this helpful
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Top reviews from other countries

Maple150
5.0 out of 5 stars Diono car seats are the best.
Reviewed in Canada on May 3, 2019
I love Diono. Watch the reviews on YouTube and I’ll say the same. Only problem is it’s really heavy.