Diono radian® 3RXT Convertible Car Seat

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$599.00 $533.19 including GST
($463.64 excluding GST & international orders)
Or 10 interest free payments from $53.32 with What's this?

The Diono radian® 3RXT is the original three across all-in-one convertible car seat, trusted by over a million parents to protect their child from birth to booster (2.3-54 kg) Lovingly engineered with the famous Diono steel core and now rear facing for even longer, expect 10 years of safety from just one car seat.

The radian® 3RXT provides safe and comfortable newborn positioning thanks to the new 2-in-1 infant positioning liner with integrated newborn travel high wedge. The wedge creates a lie flat travel position, pushing baby up to reduce head slump while helping to keep airways open. As your baby grows, simply remove the wedge to allow the 2-in-1 infant positioning liner to give extra infant comfort and toddler support.

Designed and engineered with complete rear facing protection, the radian® 3RXT will now keep your precious cargo rear facing for even longer up to 22.7 kg (approximately four years old). Then as they transition to forward facing, the aluminum reinforced headrest can be adjusted to one of 12 positions for safety that grows with them up to 144.8 cm tall.

Built with a mechanically engineered, reinforced steel core, made from automotive grade high strength steel, the radian® 3RXT is always ready to shield and protect. When your family grows, the slim fit design will fit three across in most vehicles without compromising child safety or passenger comfort.

As travel experts, Diono have naturally built in super portable features to the radian® 3RXT with original fold for easy transport and storage and steel reinforced cup holders to store essential road trip drinks and snacks. The radian® 3RXT is also aircraft certified (FAA approved), so you can take safety with you wherever you go.


  • SAFE & COMFORTABLE NEWBORN POSITIONING - Features newborn travel high wedge to create a lie flat travel position. Then as your baby grows, simply remove the wedge to allow the 2-in-1 infant positioning liner to give cosy, comforting support.
  • 10 YEARS ONE CAR SEAT - With four ways to travel from birth to booster, the radian® 3RXT adapts as your child grows to offer a custom fit from birth up to 54.4 kg.
  • LATCH - Unique SuperLATCH™ system makes installation quick and easy.
  • THE ORIGINAL THREE ACROSS - Built with our famous radian® slim fit design, to fit three across in most vehicles without compromising child or passenger comfort.
  • REAR FACING FOR LONGER - Designed and engineered to keep your child rear facing for even longer up to 22.7 kg (approximately four years old).
  • STEEL CORE - Mechanically engineered, reinforced steel core made from automotive grade high strength steel to shield and protect.

Product Specifications:

  • Rear facing 2.3-22.7 kg
  • Front facing 10-29.5 kg
  • Booster mode 18.1-54 kg
  • Seated torso height 19.1-41.9 cm
  • Overall maximum height 144.8 cm
  • Product height 72.4 cm
  • Product width 43.2 cm
  • Product depth 40.6 cm
  • Product weight 12.8 kg

    Customer Reviews

    Based on 28 reviews
    Jack Nelson

    Best car seat

    Diono radian 3RXT

    Great comfy seat for my toddler who loves it. Super quick dispatch from Winkalotts. Thank you, very happy with purchase.

    Charles Ovens
    Diono car seat

    Great Product, awesome service

    Great carseat

    Carseat so much smaller then our other two. Makes fitting 3 across super easy. Definitely very compact and solid if you need something smaller that still lasts for a good amount of time.

    Katherine Shute
    Great seat

    Great for my 5 year old, he can clip up himself
    Spacious but slimline

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    Let our customers speak for us.

    1735 reviews
    Beautiful and baby likes it

    Beautiful green colour and seems to be comfy coz baby likes sitting on it (no luck with a wee yet, though🤣)

    Fast delivery

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    Very happy with purchase

    Love the seat. It feels very high quality, great instructions therefore easy to install. Bought it because of the high limits, extended rearfacing and ECE approved.

    Great Booster

    Fantastic booster seat for our 7 year old - nice and comfortable for him, and love that it attaches with Isofix so that it's always secure when not in use, and stays in place. Other boosters seem to move side to side when my son leans!