Skip to main content
Radian® 3-across

Radian® 3-across

Smart, safe travel solutions for families since 1999

The original and the best since 2006

Radian® was born when we recognized the need for a better way to prepare for your growing family and busy back seats.

Our team of engineers began researching vehicle back seat occupancy space across the United States, Canada and beyond. We wanted to ensure that our latest innovation would be suitable for as many mid-size vehicles as possible.

As parents we never compromise safety, comfort, style or performance. We spent endless hours designing an all-in-one convertible that would not only meet the demands of busy back seats but was as safe as possible.

Radian® measures just 17” in width and has been positioned as 3-across in numerous different vehicles by a wide range of manufacturers. Not only that but we’ve seated Radian® in a combination each of its modes from rear-facing to forward-facing with harness, fitting 3-across each and every time.

01

By Kimberly Gross on October 22, 2020

Let me explain why my husband and I like the 3QXT so much: 1) This carseat is rock solid. That gives us a lot of confidence in its stability and also its capability to absorb crash forces. The steel frame just seems more sturdy than other products we considered. 2) Despite its robustness, the 3QXT is actually less bulky than other similar seats we looked at, which allows us to fit 3 across the back seat—an important feature when you have 3 boys under 5 years old like us! It almost seems as though the engineers used every inch of the seat in the most efficient manner to save on space.

This is a sturdy, nice and safe car seat.

02

By Anthony Young on May 12, 2020

Bought the purple one for our daughter due in July and will be baby number three. Until then, it’s been being “tested” by our 2yr old son. Purchased it because we already had two car seats from another brand and needed to ensure the third car seat was slim enough to fit in the back. Fits perfectly. It’s HEAVY, but well built. I can’t wait to use the newborn insert. Highly recommend the car seat. I wish I started with this brand for my first child.

Well built and gives peace of mind.

03

By Eileen on December 1, 2021

We use Diono Radians for all our kids because of the narrow three across feature. The kids are safe and secure back there! They like them too-- which is awesome because none of them liked the infant bucket seat before they graduated to Radians!

Shop the 3 across family

Radian® 3QXT+

The luxury 3 across All-in-One

$529.99

Shop Now

Radian® 3QXT

The ultimate 3 across All-in-One car seat from birth to booster

$449.99

Shop Now

Radian® 3QX

The advanced 3 across All-in-One car seat from birth to booster

$399.99

Shop Now

Radian® 3RXT Safe+®

The original 3 across All-in-One Car Seat

$349.99

Shop Now

Radian® 3RXT

The original 3 across All-in-One convertible car seat

$349.99

Shop Now

Radian® 3RX

Original slim fit 3 across all-in-one convertible car seat

$299.99

Shop Now

Radian® 3R

The original 3 across All-in-One convertible car seat

$199.99

Shop Now

Find the right car seat for you

Radian® 3QXT+

The luxury 3 across All-in-One Car Seat for first-class travel from birth to booster.

  • MSRP - $529.99
  • Advanced 4-in-1 newborn protection
  • Safe+® 2-in-1 anti-rebound panel and adjustable calf support
  • Exclusive premium fashion
  • Includes Ultra Mat Seat protector & 2 XL Cup Holders
  • Safe+® Engineering
  • 8 layers of Safe+® side impact protection
  • Safe+® side impact management pod
  • Safe+® newborn protection insert
Shop Now

Radian® 3RXT

The original 3 across All-in-One convertible car seat.

  • MSRP - $349.99
  • Award winning Radian All-in-One Convertible Car Seat
  • Rear-facing for longer
  • Slim fit design for 3 across
  • One hand easy adjust 12 position headrest
  • Steel reinforced frame

Shop Now

Radian® 3RX

Slim fit 3 across all-in-one convertible car seat.

  • MSRP - $299.99
  • 12 position headrest
  • Infant head support liner 
  • 10 years one car seat
  • Slim fit 3 across
  • Rear-facing for longer
  • Steel reinforced frame
    Shop Now

    Radian® Accessories

    Shop Now