Radian® 3-across

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.

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.

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.

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!