Diono radian® 3RXT Convertible Car Seat

Sold Out
$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 (2.3-54.4 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 2020 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.
  • 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
  • Forward facing 10-29.5 kg
  • Booster mode 18.1-54.4 kg
  • Seated torso height 19.1-41.9 cm
  • Overall maximum height 144.8 cm
  • Weight 12 kg

    Customer Reviews

    Based on 26 reviews
    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

    Great for long distance travel too

    We used this on two (back to back) long haul flights (28 hours) and our 2 year old was very comfortable. The seat can be widened and the folding seat was a bonus in transporting it between flights (whilst our son was strapped into a Mountain Buggy bagrider).
    I think you can get straps to carry like a backpack, but we fitted it into a doona padded travel bag and still had space for nappy supplies and car seat liners.

    The narrow size means I can fit in the back seat of a Nissan Juke with both my kids.
    It’s heavier than other car seats, but excels otherwise. Best car seat we’ve ever owned.

    Ideal carseat option for 3 across

    Great carseat option if you need to fit 3 across. They don't splay out on each side as much as other seats but still accommodates comfortably (from post-capsule up to at least 3 years old and counting). They're of robust steel construction and pretty heavy if you need to remove or move seats regularly though.
    Winkalotts are super quick to get deliveries on the road but are seriously let down by couriering via Aramex. Such a shame but I'd recommend buying in store or ordering to pick up if you can to avoid it getting lost in an Aramex abyss.

    Related products

    View all
    Tommee Tippee Sangenic Nappy Bin Cassette Refills - Winkalotts
    From $89.99 $39.99
    Korbell® Plus Nappy Bin Refills - Winkalotts
    $50.00 $39.49
    Diono cambria 2 Booster Seat - Winkalotts
    Diono cambria 2 Booster Seat
    Black 5
    Blue 2
    Pink 3

    3 colours available

    $209.00 $199.99
    Mountain Buggy urban jungle™ Buggy - Winkalotts
    Mountain Buggy urban jungle™ Buggy
    Berry v3.2 10
    Black v3.2 2
    Silver v3.2 3

    3 colours available

    $899.00 $764.19

    ★ Reviews ★

    Let our customers speak for us.

    1649 reviews
    Doona Capsule & Base
    Laura Mcdonald
    Great purchase

    Love my Doona
    Unable to use it as car seat as I am based in Australia however it is still my best purchase for baby.

    Up style Mum!

    Beautiful addition to Mum life!
    Roomy and fashionable!
    Enough room for mum and babe!

    Beautiful baby lambskin rug

    Lovely quality and beautiful gift for baby.

    Awesome stroller!!

    My sister has had the same stroller for 5 years, I got the same as I love the height adjustable handle, the ease of putting the pram up and down and the general movement of the pram. Currently using it for my 1 month old with the carrycot attachment and capsule attachments and loving it! Winkalotts also provided an amazing price and service. Would definitely recommend the product and store.

    Very cool

    Very very cool - takes up so little space! It would be nice if the bottom screw-piece had some kind of silicon/rubber to avoid damage to the underneath of the table. Also would be nice if one could buy spare covers!