Free shipping on orders $50+*

Diono Radian 3QXT Convertible Car Seat


(1 customer review)
or 4 installments by or
SKU: RADIAN3QXT Categories: ,


The Radian 3QXT is the ultimate 3 across All-in-One car seat from birth to booster (4-120 lb). Featuring advanced 4-in-1 newborn protection and all new Safe+® engineering to provide the next generation in car seat safety.

The most advanced Diono Radian® all-in-one convertible car seat that transforms as your child grows from baby to booster for 10 years one car seat (4-120 pounds). Now upgraded withl 25 improvements from the award-winning radian 3QXT and featuring advanced 4-in-1 rear facing protection with Safe+® engineering to provide the next generation in convertible car seat safety.

Radian® 3QXT provides complete baby and infant protection, with Safe+® newborn baby travel high wedge, newborn baby protection insert, 2-in-1 infant positioning liner and newborn baby harness pads for a custom fit from 4 pounds and up. As your child grows the Safe+® steel rear facing anti-rebound bar increases stability and reduces rebound rotation by up to 50%, so you can keep them in a safe rear facing convertible car seat for longer up to 50 pounds / 22.7 kg.

As both a rear and forward facing convertible car seat the Radian® 3QXT protects as they grow, with the Safe+® easy adjust 12 position headrest that offers a 22% increase in occupancy range from the Radian® series. With 8 layers of side impact protection, a side impact management pod, SuperLATCH connectors and safe 5-point harness, the Radian® 3QXT provides advanced safety from rear facing to forward facing harness booster to belt positioning booster modes.

Diono Radian 3QXT Convertible Car Seat Features


  • THE ULTIMATE RADIAN ALL-IN-ONE CONVERTIBLE CAR SEAT – From infant to booster seat, rear and forward facing the Radian® 3QXT adapts as your child grows for 10 years of use (4 – 120 lb)
  • 4-IN-1 NEWBORN PROTECTION – Designed for safe rear facing travel from 4 – 50 pounds / 1.8 – 22.7 kg complete with Safe+® inserts and Safe+® steel anti-rebound bar to reduce rebound rotation by 50%
  • SAFE+® ENGINEERING – Our most rigorously tested Radian® all-in-one convertible car seat; featuring Safe+® steel rear facing anti-rebound bar, steel reinforced frame, advanced side impact protection and diono SuperLATCH attachment.
  • SLIM FIT DESIGN FOR 3 ACROSS – Features 8 layers of Safe+® side impact protection (including Safe+® side Impact management pod without compromising 3 across installation in most midsize vehicles.
  • ONE HAND EASY ADJUST 12 POSITION HEADREST – Contoured to improve child head containment and provides a 22% increase in occupancy range from the radian R series.
  • AIRCRAFT CERTIFIED – FAA approved so you can take safety with you wherever you go

Diono 3QXT Convertible Car Seat User Specifications

  • Minimum – Maximum User Weight: 4-120 lbs
  • Rear Facing Minimum-Maximum User Weight: 4-50 lbs (2.3-22.7 kg)
  • Forward Facing Minimum-Maximum User Weight: 22-65 lbs (10-29.5 kg)
  • Booster Minimum-Maximum User Weight: 40-120 lbs (18-54 kg)
  • Minimum User Height: 18 inches
  • Maximum User Height: 57.1 inches
  • Minimum-Maximum User Age: 0-120 Months (Newborn to 10 Years)

Diono Radiant 3QXT Product Specifications

  • Dimensions (H x W x D): 28.5 x 17.0 x 16.0 inches
  • Folded Dimensions (H x W x D): 28.5 x 17 x 11.5 inches
  • Product Weight: 32 lbs
  • Cup Holder: Yes

Care and Maintenance For Your Diono Radian 3QXT Car Seat

For the covers, machine was cold, line dry. Shell and hard components spot clean only.

Diono Radian Warranty

12 Months Standard Warranty (extended warranty available to purchase directly from Diono

Additional information

Weight 35.9 lbs
Dimensions 18.1 × 12 × 31.1 in

, , , , ,

1 review for Diono Radian 3QXT Convertible Car Seat

  1. Queen27

    We just bought this one this year, we did the whole research thing and I seriously wish I knew about it before I bought a carrier carseat! Because this is like the best seat EVER! totally worth every penny and it is fairly easy to install. I also find that each time I see an ad or video I watch and always learn something new. So many great features it offers like I feel so safe with my baby being in it as well!

Add a review

Shopping cart

Add $50.00 more to get Free Shipping*!

Your cart is feeling a little lonely

Continue Shopping

4 interest-free payments.

Buy what you love and split the cost. It's easy and interest-free.

  • Add item(s) to your cart
  • Go to checkout and choose Klarna or Afterpay
  • Enter your debit or credit card information
  • Your first payment is taken when the order is processed and the remaining 3 are automatically taken every two weeks

See payment terms. A higher initial payment may be required for some consumers. CA residents: Loans made or arranged pursuant to a California Finance lenders Law License.