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Diono Radian 3 RXT All-in-One Convertible Car Seat - Plum

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Item # 50015-DIONO

Your child’s security is Diono's top priority. The Radian 3RXT was engineered with premium, innovative features like a steel alloy frame, aluminum reinforced sidewalls, energy absorbing EPS foam and a reinforced adjustable head support to keep your little one protected and comfortable.

The Radian 3RXT keeps children comfortably rear-facing from 5-45 pounds for the safest possible position. Premium, plush head and body support cushions are included for newborns and infants.

Accommodates forward-facing children up to 65 pounds in a 5-point harness and converts to booster mode for kids 50-120 pounds. The aluminum reinforced, adjustable head support and sidewalls provide additional side impact protection.

Diono convertible car seats are made from steel for safety you can feel. The fully integrated steel frame is wrapped in thick engineered plastic to withstand severe crash forces. Deep, aluminum reinforced sidewalls provide excellent side impact protection, while energy absorbing EPS foam surrounds your child for ultimate safety. Diono car seats are definitely worth the weight.

  • Premium, plush interlock knit fabric (available in Black Cobalt, Black Mist, Black Plum, Black Scarlet and Essex colors)
  • Full steel frame for unmatched safety
  • Comfortably seats rear-facing children from 5-45 pounds
  • Seats forward-facing children from 20-65 pounds in a 5-point harness
  • Converts to a booster for children from 50 pounds up to 120 pounds, and up to 57" tall – proper fit in booster mode
  • Unique SuperLATCH™ system makes installation easy
  • Fits 3-across in most mid-size vehicles while providing spacious interior for child
  • Folds flat for travel and is FAA certified
  • Infant body support cushions and memory foam add comfort
  • Aluminum reinforced sides with energy absorbing EPS foam additional side impact protection
  • Safe Stop® energy absorbing harness
  • 12-position adjustable headrest
  • 5 shoulder and 3 buckle positions adjust for a comfortable ride.
  • Rear-facing tether capability
  • Expandable sides and long seat bottom offer proper leg support
  • Low-sitting profile makes it easy for your child to board
  • Angled cup holder keeps drinks upright and within easy reach
  • Cover is machine washable
  • Rubber bottom grips for no-slip installation
  • 10 year life from the date of purchase

23 Reviews
87% (20)
13% (3)
0% (0)
0% (0)
0% (0)
96% Recommend this product (22 of 23 responses)
By Kimberly
Portland, OR
June 30, 2019
Love it
Fantastic. Easy to install. Feels safe.
ProsFolds flat for easy travel
By Sanjuanita
Sullivan City, Texas
June 28, 2019
Great carseat
I love my Diono car seats , it made a difference in space compared to my older Graco car seats. I definitely think there a lot more comfortable car seats.
By Peyton
Little Rock, Arksnsas
June 14, 2019
It’s Amazing.
My son absolutely hated being in his infant car seat. Not only has this seat made him happy and comfortable while riding in the car, it’s both very stylish and easy to install and clean. We love this seat!
ProsStylish Heavy Easy to clean Easy to install
By Jenn
Paso Robles, California
June 4, 2019
Fantastic Car Seat
We've been using this car seat for a few months now for my 14mo old son. It fits well in my husband's 2009 Toyota Tacoma in the rear-facing mode in the middle seat, although it does touch both of the front seats and it is quite tall. I love the look of this and the ease of getting my son in and out of the seat. We also have the Britax Advocate ClickTight Convertible Car Seat for my 2013 Honda Accord, which was much easier to install, and I love the clicking sound alerting us that the car seat is installed properly and that the harness is tight enough. This is a great car seat but I would recommend the Britax ClickTight seats (Advocate, Boulevard or Marathon) if you'd like piece of mind during installation (seat and child) and can spend the extra money.
By Sharon
Attleboro, MA
May 23, 2019
Fantastic Car Seat
Very easy to install, slim, nice features, I could keep going on. The car seat is fantastic.
By Meka
May 12, 2019
Love it!!!
I purchased this seat for my 2.5 year old son after my old Diono expired.
It is the same quality as my previous Radian 65 purchased in 2009 for my now teenage son.
No issues and I love the color choices.
Worth every penny!
By Madison
Peachtree Corners, GA
May 10, 2019
Easy Installation
This came in the mail within about 2 days of ordering which was perfect timing! My 16 month old loves his new big boy seat. It’s been easy to clean, easy to install, and we love the safety and growing features!
By C E.
Philadelphia, Pa
May 1, 2019
Improved Radian 3 RXT!
We have the previous model and although we liked it this new model is much improved! The small details that have made it much easier to use, install and just overall look! Very happy with this purchase!
By Daniella
Houston, TX
April 29, 2019
Great, slim car seat
This car seat matches perfectly with the interior of my husband's Cadillac . It's also super cushy and comfy - it seems luxe - my kids love it! The best part is the slim factor - we have 3 in a row and they all actually fit comfortably! It is super heavy, but we're not planning on taking them in and out, so no problem. We bought the optional rear-facing car seat angle adjuster and that has allowed a few extra inches of leg room for the passenger and driver. With the additional April discount, this is a great price! I would highly recommend.
ProsAttractive, lots of cushion, made of nice, soft materials, super slim and allows 3 across in a row
Best UsesIf you have 3 in a row this is a must have
By Mike
April 11, 2019
Great seat and improved design means win-win
The improved design not only means it is easier on your cars interior, but the top tether also has the tightening connector moved so it is by the clip so you can actually tighten and loosen it when the seat is snug against a headrest.
ProsNew design and cover means less wear on your interior New location of tether tightening brackets means easier to install and remove Slim design means easy to get 3 across in most vehicles Steel construction means built like a tank but also comes with the con of being heavy.
ConsThe pro of being sturdy and made from steel means it is heavier than most others.
Best Uses3 across in midsized or larger vehicles (don't own a compact size so not sure about that one).
By Sierra
Cumberland, Maryland
March 21, 2019
Best Purchase Ever
This car seat is absolutely a life saver & space saver. It’s the most comfortable car seat I’ve ever had for my kids. They absolutely enjoy sitting in a car seat for once.
By Stephanie
Douglasville, Georgia
March 16, 2019
Great Car Seat!
I now have 2 of these seats! They’re great in small cars and the plum color is beautiful. They are a bit heavy because of the frame but I don’t mind it.
By Awesome M.
Ventura, CA
March 13, 2019
Very happy mom
I have a rear and a forward-facing seat. Product arrived quickly and was very easy to assemble for rear-facing. Installation was simple for both rear and forward-facing. Only issue is when my 15 month old falls asleep she no longer has neck support on the sides of her seat and her head rests on her shoulder. I did have to get the booster pad for the rear-facing seat to make enough room in the front. I do enjoy how it is very easy to get into the middle seat in the back without climbing over a car seat awkwardly (getting in on the forward-facing side). My kids love that they can share toys and hold hands since these are low profile. Winning!
ProsLow profile. Can fit three across.
ConsHeavy. Probably not going to travel with these as we hoped. No neck support for rear facing 1 year old.
By Tabitha
Atlanta, GA
March 9, 2019
Excellent Seat and FAST shipping!
I replaced a Britax Boulevard with the seat because I bought a new car and needed a more narrow seat. This is fantastic! It fits perfectly in the middle seat of my Mercedes GLS and allows the passenger seat to fold down without hitting it! The new style just as nice as my sons Diono Rainier. I don’t feel like I’m compromising anything with the more narrow head wings.
By Michelle
February 27, 2019
Fantastic Car Seat
Diono has been a trusted brand for our family since the birth of our first child 3.5 years ago. This brand provides quality and safety all at a reasonable price. These car seats in particular are sleek and sexy, and nothing has been compromised on the safety side to accommodate for being stylish. They are able to be adjusted for any child up to booster aged kids, and this is a huge plus for us since we have a 1.5 year old and a 3.5 year old that like to switch up which seat they sit in. I know that these car seats will be the only ones we'll ever need, until our children are of the weight to sit in the car without one. We love these seats so much that we own four. We will never purchase any other type of car seat because we are confident in Diono and their products.
ProsSuper durable, washable and adjustable. Sleek and stylish.
ConsVery heavy to move from car to car.
By nikki
February 20, 2019
Fits great, my daughter loves it and it matches my Jeep perfectly!
By Robert
New Mexico
February 16, 2019
Diono Radian 3 RXT
Love the seat. The size is perfect in the center rear seat of my truck, the seat is not bulky or oversized and is very sturdy. I bought two, one for my truck and one for my wife’s car and they are great. The only problem we have had is the belt that runs along my sons neck. He says it hurts him, so we’re trying to figure out a way to make him comfortable without compromising the car seats safety.
ProsSeat size, we?ll buit, color and design, the five point harness has enough belt to fit tall kids.
ConsThe belt path next to the neck seems a little narrow.
February 14, 2019
Matches my interior perfectly
Love the color, matches my tan leather interior perfectly. Is narrow and fits perfectly in Lexus GX.
My son loves the cup holder and he is really tall and it’s perfect for his legs to bend in the right spot
By Sydney
Virginia Beach, Virginia
January 28, 2019
Excellent for Small Vehicles
We purchased two of these to fit 3 children in a Mazda CX-5 which is a fairly small back seat crossover SUV. They fit perfectly without cramping the kids, were easy to install, and look comfortable! Definitely happy with the purchase and will be buying a third when the next one comes along!
ProsFits 3 across in small sized vehicles Easy to install Safe
Best UsesSmall SUVs/cars
By Barb
Chicago, IL
January 7, 2019
Slim, Yet Comfortable Car Seat
We recently switched from the Maxi Cosi Convertible to the Diono Radian and love it! Our daughter was so squished in her Maxi Cosi. Now we all have more leg room! One of more surprising things was how much more space we now have behind the first and second row of our car. My husband had to push his seat so much further up, now we can all ride in comfort.
December 12, 2018
Nice car seat
Nice car seat
By Catherine
November 16, 2018
Comfortable and Easy to secure my child.
We bought two different carseats for our cars and the Diono is by far our favorite. My kids is comfortable, he can see out the window easily which keeps him entertained on the road. The seat is heavy but we do not move it to a different car so that isn't an issue for us. I am glad we will be able to keep our son rear facing for an extended period of time with the higher rear facing weight limit.
ProsEasy to buckle. Cup holder can be on either side. Cover is easy to remove and wash.
ConsHeavy. Leans back pretty far (we had to install in the center seat, but with only one kid we actually prefer that placement)
By Steph
October 15, 2018
Love it!
Perfect for fitting three across in our back seat in combination with a Clek foonf for my toddler and an uppababy mesa for my new born. My preschooler loves it too!

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