Diono Radian 3RXT

9.0 score
[Editors rating (9.0)] = (DrivrZone.com) score (9.0)/10

Editor rating: 9.0 / 10
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Diono Radian 3RXT Review Facts

There are plenty of things that you want to take into consideration when you go to purchase a car seat for your child. The most important features to look at are safety and comfort. However, all the other additional features are simply up to personal preference. Finding a good car seat that has been highly reviewed by many other parents can tend to be a rather overwhelming process, especially if you are a new parent yourself.

The Diono Radian 3RXT is an option that seems to fit the bill on all levels. Sure, there are some areas where parents feel that it has been lacking, but that doesn’t at all mean that you won’t be able to get a lot of use out of this product- and most importantly, that you won’t feel as though your child is as safe as they possibly can be. Some people thought that this car seat was a bit expensive and that it was a bit heavy to use outside of the car. Otherwise, the fact remains that this Diono product is one of the highest-rated car seats on the market.

Now, we will talk about all the different features that the car seat has to offer and why so many parents have written rave reviews about it.

Editor's Pros & Cons
  • Narrow seat great for smaller cars
  • 10-year warranty
  • Has a steel frame
  • There are 13 different colors
  • Has great safety features
  • Will fold flat when you want to transport it
  • Difficult to install
  • Some think it’s heavy
  • Not meant to be used for newborns

Basic Features

This car seat has been approved for use on airplanes, which could be an attractive option for people who enjoy traveling a lot as a family.

Children who are between 5 and 45 pounds and who are less than 44 inches can fit in the car seat in the rear-facing position. However, some people have found that it does not provide the best protection for newborns simply because the harness straps might be too loose. If you have a particularly small newborn, then this is something you will want to consider. Also, the rear-facing position is lacking in reclining abilities, which could cause some problems for your newborn’s head.

In the forward-facing position, this car seat will be able to accommodate a child who weighs between 20 and 65 pounds and who is below 57 inches. If you wish to use the seat as a booster seat, you will need to make sure that your child is between 5 and 120 pounds. It is recommended that your child’s shoulders remain above or around the 4th strap slot. Whether or not you choose to use the booster seat depends on how big or small your child is. Something else that many parents noted is that their children tended to outgrow the seat before they reached these limits, so that’s something you may want to consider.

Another great feature of this product is that the seats are narrow, so you will be able to easily fit three people in the backseat of your car- or, if you have several children, you can fit all of their car seats in the back with no problem.

Advanced Features

Some of the more advanced features of this product include its safety features. Of course, this is one of the most important parts of any car seat. It has a sturdy steel frame and plenty of cushioning to provide protection against impact. We will talk more about the safety features that this product has to offer below.

It’s also a product that is easy to store due to the fact that it is able to fold completely flat. So, if you want to be able to store it somewhere, take it with you when you’re moving, etc., you will easily be able to do that with this product.

Another feature that plenty of parents appreciated was the fact that there is a cloth cover which can be used for the seat’s back side. This is meant to improve the seat’s aesthetic abilities. All of the cushions and fabric can be washed in the washing machine, which will make things a lot easier for new parents.

And, as we mentioned above, this seat is meant for use by children who weigh up to 120 pounds. While some parents found that their children outgrew the seat before they reached the size limits, it still shows that you’re going to be getting plenty of use out of this product and you won’t have to worry about purchasing another car seat.


When it comes to size, there is one area that plenty of parents appreciated about this product: it’s narrow, so if you need to make sure that three people are able to sit in the backseat of your car, this is the perfect choice for you. This is a feature that a lot of people liked because many car seats are rather large and only allow for one other person to be able to sit in the backseat. The only downside to the size of this product is that it may cause a problem for someone sitting in the front passenger seat because it is rather long. The person in the front will have to adjust their seat, which means that they might get less leg room.

The seat is 16.5 inches wide and 24.5 inches long (the shell height). Something that many parents who have multiple children like to do is purchase three of these seats and set them all together. Since the seat is narrow enough to allow for three people to sit in the back, it’s also good for if you have multiple young children.

However, considering the fact that the seat is quite large in other aspects, many people recommend that you measure your car before you purchase this product. When you use the seat in the rear-facing position, it will cause a problem for the person sitting in the passenger seat. The size of your car will have a great impact on how much of a problem this will cause. Typically, this seat is recommended for people who have medium to large-sized cars.

Ease of Use

Some people found that installing this was a little bit tricky, but did note that it got easier when they did it several times. Another thing they found was that the user’s manual and the stickers on the sides of the seat were not too helpful, either. So you may end up having to watch several videos online if you want to make sure that you’ve installed the seat correctly. Also, it’s difficult to make sure that the seat is at a good angle when it’s in the rear-facing position due to the fact that you won’t be able to adjust the angle.

The system that allows you to tighten the harness in this model is a lot easier to use, however, because you only will need to pull the adjustment strap instead of using the ratcheting system.

Also, the sides of this car seat are rather low, which means that if your child is able to get in and out of their seat on their own, they will have a much easier time doing so. It’s also easy to transport when you need to travel because the seat has the ability to be folded completely flat.


This does not come with any accessories of its own, although people have said that you can choose to get a compatible carry strap made by the same brand, which is meant to allow you to carry the seat as though you were carrying a backpack if you are traveling.


One area where almost all parents agreed on the high-quality of this car seat was when it came to its safety features. Some people even mentioned that they were involved in accidents where their children were sitting in this seat and did not even come out with a scratch. There have been many tests and real-life cases that have proven how safe this product is for children in the event of an accident.

It also features a headrest which can be adjusted in 12 different positions, as well as cushions that are meant to absorb any sort of impact. It has a memory foam seat bottom and a tight harness that will allow your child to remain safe and secure in the seat at all times.


This seat also does not skimp out on comfort. Considering the fact that it is able to accommodate children who are a wide range of sizes, it should come to no surprise that your three-year-old and your first grader will feel comfortable in the seat. There are plenty of soft cushions all around the seat that allow your child to feel snug, and the seat bottom is made out of memory foam.


One potential downside to this product is the fact that it’s really heavy. So, if you were looking for the perfect car seat to be able to travel with, you certainly won’t be able to do that here. However, a lot of parents did purchase this simply to leave it in their car, so if you aren’t planning on using it for any other purpose, then the weight probably won’t be much of an issue for you. The car seat weighs 24 pounds, and when you add the weight of your child to it, you get a very heavy product overall. However, one of the positive things to note about this is that many car seats that weigh a lot less tend to feel quite cheap. This one is sturdy and feels like you are getting a high-quality product out of the deal.


For some people, the price point of this product might be a little high, but it isn’t too bad for a car seat that is considered to be on the higher end and made out of higher quality materials than others. You will be able to purchase this product on Amazon for $255. This might cause some people to raise eyebrows, especially if you’re on a budget, but if you are to compare the price of this product to the price of similar ones, and of car seats that have received as high of ratings as this, then you’ll see that you aren’t getting too bad of a deal.

Key Features

You have a 10-year warranty with this product should anything go wrong
There are 13 colors to choose from
There is impact protection on the sides
It has soft fabric cushioning
The seat is made out of memory foam
There is a cloth cover for the back of the car seat
Includes plenty of safety features

Bottom Line

Finding a good car seat that will not only keep your child safe but also that will make sure to keep them comfortable is a difficult task for many parents. There are plenty of options on the market that are sturdy, durable, and comfortable. One of these is the Diono Radian 3RXT. You’re going to be getting a lot of use out of this product at the end of the day, and you’ll be able to use it for a variety of occasions. Yes, there were some features about it that parents didn’t like, such as the fact that it is quite heavy and not suitable for transport (it is approved to be used on airplanes, but not too many parents want to carry a 24-pound car seat with them).

However, that doesn’t take away from the fact that this is one of the highest-rated car seats on the market. It’s going to be comfortable for your children and it will provide them with all the proper safety features they need. Whether or not you want to spend $255 on a car seat is up to you, but we think it’s a great deal especially considering all the features it has to offer.