Safe Convertible Car Seats

Diono Radian 3QXT Review (2021): Luxury + Engineering = A High-End Winner

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Diono 2020 Radian 3QXT Latch, All-in-One Convertible Car Seat, Red Cherry

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In our Diono Radian 3QXT review, we look at Diono’s latest model in their line of high-end, crash-tested convertible car seats.

Here’s a quick rundown of this model’s features:

  • The Radian 3QXT is a convertible car seat parents can use from when their babyis born until the child reaches 120 pounds
  • The car seat is of the highest quality, providing both luxurious comfort and full protection
  • The Radian 3QXT includes Diono Safe+ engineering for exceptional safety
  • The car seat is ideal for newborns due to the travel high wedge, protection insert, positioning liner and harness pads.
  • All of these features combine to ensure the fit for newborns can be customized. The car seat grows along with the child with a longer period of time spent in a safer rear-facing position. Rotation is decreased a maximum of 50 percent, with stability increased due to the steel anti-rebound feature. The child can continue using the rear-facing position until 50 pounds, or roughly the age of four.
  • The forward-facing position includes a contoured headrest with 12 available positions. The headrest helps contain the head of the child for a safer ride. Diono has developed a reputation for travel-friendly car seats, and the Radian 3QXT is no exception.
  • The car seat folds flat easily, with approval from the FAA for travel on airplanes

This is a top of the line, luxurious car seat!

Now let’s get into the details:

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Quick Navigation
Diono Radian 3QXT Overview
Video Overview of Diono Radian 3QXT 
Diono Radian 3RXT Specs
Diono Radian 3QXT Features 
Who is the Diono Radian 3QXT Most Suitable For?
What is Included with the Diono Radian 3QXT?
Pros and Cons of the Diono Radian 3QXT
Diono Radian 3QXT Installation 
Diono Radian 3QXT Manufacturer's Manual 
Diono Radian 3QXT vs Diono Radian 3RXT
Magic Beans Videos Diono Radian 3QXT Review
The Bottom Line

Diono Radian 3QXT Overview

Diono 2020 Radian 3QXT Latch, All-in-One Convertible Car Seat, Red Cherry

One of the best features of the Radian 3QXT is the newborn protection encompassing four different stages. All Diono car seats have passed rigorous collision testing including rear, front and side impacts. To ensure the car seat is safe, rollover testing is also conducted. The Radian 3QXT will last for approximately ten years, ensuring a customized fit through adaptability.

The slim-fit design provides the car seat with a narrower profile. Parents with several children will be able to place three of the Radian 3QXT next to one another in the back seat of most vehicles. This will not affect the comfort of the children. For parents interested in a car seat offering the latest technology, true comfort, and exceptional safety, the Radian 3QXT is a great option.

Video Overview of Diono Radian 3QXT 

Diono Radian 3RXT Specs

  • Rear-facing position for children from four to 50 pounds
  • Forward-facing position for children from 22 to 65 pounds
  • Booster position for children from 40 to 120 pounds
  • Height for seated torso between 7.5 and 16.5 inches
  • Maximum child height of 57 inches
  • Three Radian 3QXT fit in the average-sized backseat
  • Seat weight is 25.8 pounds
  • Newborn harness pads
  • Newborn protection insert
  • Management pod for side impacts
  • Newborn high wedge
  • Headrest is adjustable with 12 positions
  • Anti-rebound bar constructed of steel
  • One cup holder
  • Steel core
  • Memory foam
  • Cover is machine washable

Diono Radian 3QXT Features 

Safety Features

  • The Radian 3QXT was created with the most recent European technology and research available to manage energy during collisions. The car seat offers side protection consisting of eight separate layers. The management pod channels the energy to the back of the Radian 3QXRT if there is a side impact to keep this energy away from the child.

These are two of the layers consisting of EPP and EPS foam, steel reinforcement, and high-density plastic to keep the child safe during a side-impact collision. Despite the numerous layers of protection, the car seat has a slimmer width.

  • Further protection is ensured through the steel anti-rebound bar. When a collision occurs, rebound rotation is decreased by 50 percent to provide even more protection.
  • The management pod provides protection from side impacts. The pod is positioned on the side of the Diono Radian 3QXT, next to the door. The engineering channels the energy to the back of the Radian 3QXT in case of a collision, and away from the infant.
  • The Radian 3QXT has received rigorous crash testing for rear, front and side collisions. Parents can be assured their child is receiving the best protection currently available including rollover testing.
  • The core of the car seat is constructed from automotive-grade, upgraded steel. The strength of the steel protects, and shields the child from harm.
  • Side impact technology from Europe is used to contain the head of the child in the event of a crash. The height of the headrest has been increased 22 percent from the previous Diono models. The car seat provides 12 positions for the headrest.
  • The travel high wedge is created for newborns to enable the baby to lie flat. This helps ensure the airways remain open, while decreasing head slump. Parents simply remove the wedge as the baby grows.
  • The two-in-one positioning liner provides infants and toddlers with additional body support.
  • Harness pads are included for smaller newborns to increase both comfort and safety.
  • An extra headrest is included with the car seat as a safety precaution, in addition to helping to prevent the head of the child from drooping while napping.

Convertible Car Seat Features

  • The car seat offers different positions for a variety of heights and weights from newborn babies to a weight of 120 pounds. The rear-facing position is for children between four and 50 pounds. The forward-facing position is for kids between 22 and 65 pounds. The booster position includes a belt for older children between 40 and 120 pounds, with a height limit of 57 inches.
  • The Radian 3QXT is classified as a four-in-one car seat. This means the car seat grows with the child from the pillow insert for newborns to the booster seat for children of school age. Parents have peace of mind knowing one car seat will carry their child safely from the time they are born until they reach 120 pounds. Despite the compact nature of the car seat, the construction is excellent.

Design Features

  • Another excellent feature of the Radian 3QXT is the memory foam ensuring the child has additional cushioning. Most parents are familiar with memory foam pillows and mattresses. The car seat offers the same advantages for infants and children. In addition to retaining the shape of the child, the memory foam will not wear out, and helps absorb shock.
  • The newborn protection insert is constructed from materials capable of absorbing energy for both protection and support. Newborns will remain comfortable due to the extremely soft padding. As the baby grows, the insert is removed.
  • Both the harness and seat include a lot of cushioning and padding to provide the child with exceptional comfort. As the newborn grows, parents simply remove the newborn liner. The remaining padding ensures infants and toddlers will still be comfortable. With or without the liner, the car seat does not require a lot of space in the vehicle.

Usage Features:

  • The Radian 3QXT is constructed so parents can fold the car seat flat. This means the car seat will easily fit into the vehicle trunk, can be carried with much less effort, and is ideal for traveling on an aircraft. The weight is only 28 pounds, so the majority of parents can carry the car seat from place to place without any difficulties.

Who is the Diono Radian 3QXT Most Suitable For?

Diono 2020 Radian 3QXT Latch, All-in-One Convertible Car Seat, Red Cherry

The car seat is appropriate for taking a newborn baby home from the hospital until a weight of 120 pounds. In the rear-facing position, the car seat protects a child from four to 50 pounds. Once converted to the forward-facing position, the seat accommodates children 22 to 65 pounds. The final position is the booster seat. Children a maximum of 57 inches in height, and 40 to 120 pounds can ride comfortably.

What is Included with the Diono Radian 3QXT?

The car seat includes:

  • Travel high wedge for newborns
  • Two-in-one positioning liner for infants
  • Management pad for side-impact collisions
  • Cup holder reinforced with steel
  • Removable cover
  • Anti-slip harness pads
  • Protection insert for newborns
  • Steel anti-rebound bar

Pros and Cons of the Diono Radian 3QXT

Pros

  • Headrest provides 12 positions
  • The premium upholstery is plush, and available in numerous colors
  • Three Radian 3QXT's will fit in the average vehicle side by side
  • Folds flat for both traveling and storage
  • Cover is machine washable
  • The Radian 3QXT is approved by the FAA for airline travel
  • Options for installation with the vehicle belt or SuperLatch system
  • Safety features including side-impact protection, steel frame and energy absorption
  • The car seat provides protection for 10 years or until 120 pounds

Cons

  • Installation of the car seat can be difficult in certain vehicles including installing three car seats side by side or when using the Latch system. Despite being a narrow enough width to install three car seats, parents will have extremely little room between the car seats for installation.
  • Installing the Radian 3QXT in specific models can result in issues for the rear-facing positions. The position of the vehicle's front seat often slides forward. This means the car seat must remain in an upright position as opposed to reclined. The angle adjuster is not helpful until the infant has the capability of holding up their head by themselves.
  • Expensive
  • The car seat must be uninstalled completely before the height of the harness can be adjusted, or the cover removed for washing. If the parents have difficulty installing the car seat, this presents an issue.
  • The position of the shoulder straps are fairly close together. This may be uncomfortable for a child with a broader torso or shoulders.
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Diono Radian 3QXT Installation 

Tutorial videos for installation of the Radian 3QXT are available at:

Diono Radian 3QXT Manufacturer's Manual 

The manufacturer's manual is available at:

Click to download Diono Radian 3QXT manual here.

Diono Radian 3QXT vs Diono Radian 3RXT

Diono 2020 Radian 3QXT Latch, All-in-One Convertible Car Seat, Red Cherry

VS

Diono 2019 Radian 3RXT All-in-One Convertible Car Seat, Black

Both the Diono Radian 3QXT and 3RXT are safe and comfortable car seats. The appearance and style of both models are very similar. The shape is different, and the Radian 3QXT offers more accessories included with the car seat to protect newborns. There is no anti-rebound bar with the Radian 3XRT for the rear-facing position. Both models include a cupholder to ensure the child has a drink available while traveling.

The covers for both car seats are removable, and machine washable for convenience. There is also a slight difference in the minimum weight limits for the car seats. Although both have a maximum weight limit of 50 pounds, the minimum limit for the Radian 3RXT is five pounds. Every model in the Q series is safe for babies only four pounds. The 3XRT may present an issue for very small babies.

The 3RXT does not include extended sidewalls, protection for either side or rear impacts, a steel core, or a wedge for newborn babies. The testing for rear impacts, and rollovers are more extensive for the Radian 3QXT. Diono manufacturers both models, ensuring quality and safety. If the parents intend to install just one or two car seats in the vehicle, the seat width of the Radian 3RXT can be expanded to provide the child with a little more room.

Both the Radian 3QXT and 3RXT are manufactured with dual spines, and automotive strength steel. Both models include a headrest offering 12 positions, side-impact protection, a cup holder, anti-slip harness, low seats and memory foam. The final notable difference is the Radian 3QXT is manufactured with cutting-edge technology. The protection and safety of the 3QXT are slightly ahead of the 3RXT.

Magic Beans Videos Diono Radian 3QXT Review

The Bottom Line

The Radian 3QXT is simply awesome, because of its many excellent qualities.

The design enables parents with two or three children to have car seats in the back of the vehicle to accommodate everyone. The car seat is also a good option if the parents intend to have more children. A convertible car seat is a good investment for the comfort and safety of the child that will remain suitable for about 10 years.

The features of the car seat are important for parents including the steel anti-rebound bar, side impact protection for collisions, luxurious comfort, and exceptional functionality. 

Diono 2020 Radian 3QXT Latch, All-in-One Convertible Car Seat, Red Cherry

Radian 3QXT (click image for more info)

The Radian 3QXT performed well in rollover, side-impact, rear, and front crash testing. Parents interested in the best protection currently available for their child should consider the Diono Radian 3QXT.

Many of the less inexpensive car seats are only suitable for a period of four to five years as opposed to 10. The Radian 3QXT also offers a good range of color options for personalization.

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