Radian® 3-across

The original all-in-one convertible car seat since 2006

Radian® was born when our expert team recognized the need for a better way to prepare for your growing family and busy back seats while keeping your very important passenger as safe as possible.

The original 3-across Radian® features a slimline, space-saving design at only 17” wide that allows you to install three across in most mid to large-sized vehicles in a variety of configurations from rear-facing to forward-facing with harness, fitting 3-across each and every time.

Engineered with the famous diono® full steel core for maximum safety. This high-strength core has inherent integrity and forms an unyielding structure to shield and protect your child. We didn’t stop there; our aluminum-reinforced sides and thick energy-absorbing foam distribute crash forces to guard your child’s vulnerable side and head, which is critical in side-on collisions.

By Kimberly

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 Crisa

I am in the military and travel a lot. My children (2&3 yrs old) and I were sleeping in the middle seat of a Nissan Armada when we were in a tragic motor vehicle accident on a freeway. This car seat not only save them but also me as I was wedged in the middle of the car seats. I was unconscious while the car caught on fire and I awoke to my children and I upside down. I instantly went into ‘mom mode’ and was able to unbuckle both children with ease while we were upside down and my children and I were able to crawl out one of the windows. Neither one of them had a scratch nor did they have any seatbelt bruising. The car rolled front over back and rotated multiple times leaving us in a ditch upside down. LIFE SAVER.

By Eileen

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!

By Joseph

Saved all 3 of my children’s lives in a roll over accident everyone came out without a scratch. The police even said normally kids and most adults don’t survive rollovers like ours where we went over a retaining wall and a guard rail. The police said it was the car seats that saved the kids.

By Anthony

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.