null
Skip to main content
Cart 0
Your Bag
  1. Home
  2. Car Seats
  3. Radian® 3QX

Radian® 3QX

$379.99
Radian® 3QX all-in-one convertible car seat [Blue Sky]
Featuring Complete 3 stage newborn protection [Blue Sky]
Anti-rebound bar reduces rebound by 50% [Blue Sky]
22% increase in headrest occupancy from Radian® R Series [Blue Sky]
Safe+® Engineering [Blue Sky]
10 years one car seat [Blue Sky]
Rear-facing from 4 lb [Blue Sky]
Rear-facing for longer [Blue Sky]
Slim fit 3 across forward facing [Blue Sky]
Safe+® newborn travel high wedge [Blue Sky]
6 layers of side impact protection [Blue Sky]
Safe+® steel core [Blue Sky]
Memory foam cushion seat base [Blue Sky]
12 position easy adjust headrest [Blue Sky]
Rear-facing for longer up to 50 lbs [Blue Sky]
Radian® 3QX all-in-one convertible car seat [Black Jet]
Featuring Complete 3 stage newborn protection [Black Jet]
Anti-rebound bar reduces rebound by 50% [Black Jet]
22% increase in headrest occupancy from Radian® R Series [Black Jet]
Safe+® Engineering [Black Jet]
10 years one car seat [Black Jet]
Rear-facing from 4 lb [Black Jet]
Rear-facing for longer [Black Jet]
Slim fit 3 across forward facing [Black Jet]
Safe+® newborn travel high wedge [Black Jet]
6 layers of side impact protection [Black Jet]
Safe+® steel core [Black Jet]
Memory foam cushion seat base [Black Jet]
12 position easy adjust headrest [Black Jet]
Rear-facing for longer up to 50 lb [Black Jet]
Radian® 3QX all-in-one convertible car seat [Gray Slate]
Featuring Complete 3 stage newborn protection [Gray Slate]
Anti-rebound bar reduces rebound by 50% [Gray Slate]
22% increase in headrest occupancy from Radian® R Series [Gray Slate]
Safe+® Engineering [Gray Slate]
10 years one car seat [Gray Slate]
Rear-facing from 4 lb [Gray Slate]
Rear-facing for longer [Gray Slate]
Slim fit 3 across forward facing [Gray Slate]
Safe+® newborn travel high wedge [Gray Slate]
6 layers of side impact protection [Gray Slate]
Safe+® steel core [Gray Slate]
Memory foam cushion seat base [Gray Slate]
12 position easy adjust headrest [Gray Slate]
Rear-facing for longer up to 50 lb [Gray Slate]
Radian® 3QX all-in-one convertible car seat [Purple Plum]
Featuring Complete 3 stage newborn protection [Purple Plum]
Anti-rebound bar reduces rebound by 50% [Purple Plum]
22% increase in headrest occupancy from Radian® R Series [Purple Plum]
Safe+® Engineering [Purple Plum]
10 years one car seat [Purple Plum]
Rear-facing from 4 lb [Purple Plum]
Rear-facing for longer [Purple Plum]
Slim fit 3 across forward facing [Purple Plum]
Safe+® newborn travel high wedge [Purple Plum]
6 layers of side impact protection [Purple Plum]
Safe+® steel core [Purple Plum]
Memory foam cushion seat base [Purple Plum]
12 position easy adjust headrest [Purple Plum]
Rear-facing for longer up to 50 lb [Purple Plum]
Radian® 3QX all-in-one convertible car seat [Red Cherry]
Featuring Complete 3 stage newborn protection [Red Cherry]
Anti-rebound bar reduces rebound by 50% [Red Cherry]
22% increase in headrest occupancy from Radian® R Series [Red Cherry]
Safe+® Engineering [Red Cherry]
10 years one car seat [Red Cherry]
Rear-facing from 4 lb [Red Cherry]
Rear-facing for longer [Red Cherry]
Slim fit 3 across forward facing [Red Cherry]
Safe+® newborn travel high wedge [Red Cherry]
6 layers of side impact protection [Red Cherry]
Safe+® steel core [Red Cherry]
Memory foam cushion seat base [Red Cherry]
12 position easy adjust headrest [Red Cherry]
Rear-facing for longer up to 50 lb [Red Cherry]
Radian® 3QX all-in-one convertible car seat [Yellow Mineral]
Featuring Complete 3 stage newborn protection [Yellow Mineral]
Anti-rebound bar reduces rebound by 50% [Yellow Mineral]
22% increase in headrest occupancy from Radian® R Series [Yellow Mineral]
Safe+® Engineering [Yellow Mineral]
10 years one car seat [Yellow Mineral]
Rear-facing from 4 lb [Yellow Mineral]
Rear-facing for longer [Yellow Mineral]
Slim fit 3 across forward facing [Yellow Mineral]
Safe+® newborn travel high wedge [Yellow Mineral]
6 layers of side impact protection [Yellow Mineral]
Safe+® steel core [Yellow Mineral]
Memory foam cushion seat base [Yellow Mineral]
12 position easy adjust headrest [Yellow Mineral]
Rear-facing for longer up to 50 lb [Yellow Mineral]
Radian® 3QX all-in-one convertible car seat [Blue Sky]

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


$379.99
Klarna
or 4 interest-free payments of $95.00. Learn More
OR

Enjoy worry-free buying and perks with the Diono Difference

Recieve perks when you shop on diono.com

Additional 2-Year Warranty

Receive an additional 2-year warranty on all car seats and strollers purchased from diono.com

Free Shipping on orders over $400*

Diono proudly offers free shipping on orders over $400

Unlock exclusive offers & discounts

Unlock exclusive news, offers and discounts on all diono.com products.

1-2-1 Virtual Car Seat Fitting

Book a 1-2-1 virtual car seat fitting with a member of our car seat safety team.

* T & C's apply

Radian® 3QX

The advanced 3 across All-in-One car seat from birth to booster 4 - 120 lb (1.8 - 54 kg). Featuring 3 stages of complete rear facing protection and all new Diono Safe+® engineering to provide the next generation in car seat safety

Features:

  • NEXT GENERATION RADIAN ALL-IN-ONE CONVERTIBLE CAR SEAT - From infant to booster seat, rear and forward facing the Radian® 3QX adapts as your child grows for 10 years of use (4 - 120 pounds / 1.8 - 54 kg ).
  • 3-IN-1 REAR FACING 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 - 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 6 layers of Safe+® side impact protection 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.

Product Specs

  • Minimum User Weight: 4 lb / 1.8 kg
  • Maximum User Weight: 120 lb / 54 kg
  • Number of Head Support Positions: 12
  • Minimum User Weight - Rear Facing: 4 lb / 1.8 kg
  • Maximum User Weight - Rear Facing: 50 lb / 22.7 kg
  • Maximum User Weight - Rear Facing LATCH: 35 lb / 15.8 kg
  • Minimum User Weight - Forward Facing: 22 lb / 10 kg
  • Maximum User Weight - Forward Facing: 65 lb / 29.5 kg
  • Maximum User Weight - Forward Facing LATCH: 40 lb / 18 kg
  • Minimum User Weight - Booster: 40 lb / 18 kg
  • Maximum User Weight - Booster: 120 lb / 54 kg
  • Maximum User Height: 57.1 in / 145 cm
  • Product Height: 28.5 in / 72.4 cm
  • Product Width: 17 in / 43.2 cm
  • Product Depth: 16 in / 40.6 cm
  • Seat Weight: 31.3 lb / 14.2 kg

Care & Maintenance

Covers: Machine wash cold, line dry. Shell and Components: Spot clean

Warranty Information

12 months warranty - extended to 36 months when you register with Diono® post purchase

Welcome to the Next Generation- Radian Q

The Diono Difference

The Radian® Q series exclusively features Diono Safe+® engineering, our unique combination of car seat engineering and rigorous testing to provide the best possible protection for your child.
Every Radian® All-in-One Convertible Car Seat is designed to adapt as your child grows to offer a custom fit from birth to booster (up to 120 lb.)
Built with our famous Radian® slim fit design, to fit 3 across in most vehicles without compromising child or passenger comfort.
Engineered to keep your child rear-facing for longer up to 50 lb.

Plays well with

Angle Adjuster Car Seat Leveler, Car Seat Wedge Cushion, Provides More Legroom For Rear-Facing Car Seats [Black]

Angle Adjuster

$24.99

Elevates All-in-One convertible car seats to a more upright position

Customers Also loved

Radian® 3QXT All-in-one convertible car seat [Purple Plum]

Radian® 3QXT

$399.99

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

Radian® 3R all-in-one convertible car seat [Blue Sky]

Radian® 3R

$199.99

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

Angle Adjuster Car Seat Leveler, Car Seat Wedge Cushion, Provides More Legroom For Rear-Facing Car Seats [Black]

Angle Adjuster

$24.99

Elevates All-in-One convertible car seats to a more upright position

Diono Ultra Mat XXXL Extra Large Car Seat Protector For Complete Protection Against Dirt & Scratches, Crash Tested, High Strength, Water Resistant Material With Thick Padding For Durable Protection [Black]

Ultra Mat XXXL

$69.99

Provides complete backseat protection - perfect for busy back seats

Reviews