---
product_id: 489083175
title: "DionoRadian 3RXT SafePlus, 4-in-1 Convertible Car Seat, Rear and Forward Facing, SafePlus Engineering, 3 Stage Infant Protection, 10 Years 1 Car Seat, Slim Fit 3 Across, Black Jet"
brand: "diono"
price: "A$978"
currency: AUD
in_stock: true
reviews_count: 8
url: https://www.desertcart.com.au/products/489083175-dionoradian-3rxt-safeplus-4-in-1-convertible-car-seat-rear
store_origin: AU
region: Australia
---

# Slim fit 3-across design Steel core safety shell FAA airline approved DionoRadian 3RXT SafePlus, 4-in-1 Convertible Car Seat, Rear and Forward Facing, SafePlus Engineering, 3 Stage Infant Protection, 10 Years 1 Car Seat, Slim Fit 3 Across, Black Jet

**Brand:** diono
**Price:** A$978
**Availability:** ✅ In Stock

## Summary

> 🚗 Safety Meets Sleek: The Only Car Seat Your Family Will Ever Need!

## Quick Answers

- **What is this?** DionoRadian 3RXT SafePlus, 4-in-1 Convertible Car Seat, Rear and Forward Facing, SafePlus Engineering, 3 Stage Infant Protection, 10 Years 1 Car Seat, Slim Fit 3 Across, Black Jet by diono
- **How much does it cost?** A$978 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/489083175-dionoradian-3rxt-safeplus-4-in-1-convertible-car-seat-rear)

## Best For

- diono enthusiasts

## Why This Product

- Trusted diono brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Slim Fit 3-Across:** Innovative design fits three seats side-by-side without compromising comfort or safety.
- • **Travel-Ready & Compact:** FAA approved and folds flat for effortless travel and storage—because safety should never slow you down.
- • **10 Years, 4 Modes, 1 Seat:** From newborn to booster, this all-in-one grows with your child for a decade of ultimate protection.
- • **SafePlus Rear-Facing Engineering:** Steel anti-rebound bar cuts rebound rotation by 50%, maximizing infant safety up to 50 lbs.
- • **12-Position Headrest & 6-Layer Side Impact:** One-hand adjustable headrest with multi-layered side protection ensures a perfect, secure fit every time.

## Overview

The Diono Radian 3RXT SafePlus is a 4-in-1 convertible car seat engineered with reinforced steel and SafePlus technology, offering 10 years of use from birth to booster (4-120 lbs). Its slim-fit design allows three seats to fit side-by-side, while 6 layers of side impact protection and a steel anti-rebound bar enhance safety. FAA approved and foldable for travel, it combines durability, comfort, and convenience for the modern family on the go.

## Description

DionoRadian 3RXT SafePlus, 4-in-1 Convertible Car Seat, Rear and Forward Facing, SafePlus Engineering, 3 Stage Infant Protection, 10 Years 1 Car Seat, Slim Fit 3 Across, Black Jet

## Features

- 10 Years One Car Seat - from Birth to Booster (4 - 120 lb) it's all you will need. Grows with your child, ultimate protection on every road trip. 4 modes in 1 seat!
- SafePlus Rear-Facing Engineering up to 50 lb. With 3 modes of newborn protection, our steel anti-rebound bar reduces rebound rotation by up to 50%.
- Fits 3-Across - our famous slim-fit design with SafePlus 6-layer side impact protection with zero compromises to safety, space, or comfort.
- Mechanically engineered from reinforced automotive grade high-strength steel, our unique core shell shields and protects your child.
- One hand easy-adjust 12-position headrest, the SafePlus completes 6 layers of enhanced, rigorously tested, side impact protection.
- The original and only all-in-one convertible car seat that folds for travel or compact storage. FAA approved for airline use.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| Product Dimensions | 16 x 17 x 28.5 inches |
| Item model number | 50100 |
| Minimum weight recommendation | 4 Pounds |
| Maximum weight recommendation | 120 Pounds |
| Minimum height recommendation | 18.1 Inches |
| Maximum height recommendation | 57.1 Inches |
| Material Type | Alloy Steel, Polypropylene, Plastic, Polystyrene |
| Material Composition | 100% Polyester |
| Care instructions | Covers: Machine wash cold and line dry. Shell and Components: Spot clean |
| Additional product features | Fits 3 Across |
| Number Of Items | 1 |
| Style | Radian 3RXT SafePlus |
| Number of reclining positions | 12 |
| Batteries required | No |
| Orientation | Convertible Seat |
| Rear-facing minimum child weight | 4 Pounds |
| Rear-facing maximum child weight | 50 Pounds |
| Forward-facing minimum child weight | 22 Pounds |
| Forward-facing maximum child weight | 120 Pounds |
| Harness type | 5-Point |
| Item Weight | 30.6 pounds |
| Country/Region of origin | China |

## Product Details

- **Brand:** Diono
- **Installation Type:** Latch
- **Material:** Alloy Steel, Polypropylene, Plastic, Polystyrene
- **Color:** Black Jet
- **Orientation:** Convertible Seat

## Images

![DionoRadian 3RXT SafePlus, 4-in-1 Convertible Car Seat, Rear and Forward Facing, SafePlus Engineering, 3 Stage Infant Protection, 10 Years 1 Car Seat, Slim Fit 3 Across, Black Jet - Image 1](https://m.media-amazon.com/images/I/717o43m3PhL.jpg)
![DionoRadian 3RXT SafePlus, 4-in-1 Convertible Car Seat, Rear and Forward Facing, SafePlus Engineering, 3 Stage Infant Protection, 10 Years 1 Car Seat, Slim Fit 3 Across, Black Jet - Image 2](https://m.media-amazon.com/images/I/71hvkGS23RL.jpg)
![DionoRadian 3RXT SafePlus, 4-in-1 Convertible Car Seat, Rear and Forward Facing, SafePlus Engineering, 3 Stage Infant Protection, 10 Years 1 Car Seat, Slim Fit 3 Across, Black Jet - Image 3](https://m.media-amazon.com/images/I/81ieJlsfYyL.jpg)
![DionoRadian 3RXT SafePlus, 4-in-1 Convertible Car Seat, Rear and Forward Facing, SafePlus Engineering, 3 Stage Infant Protection, 10 Years 1 Car Seat, Slim Fit 3 Across, Black Jet - Image 4](https://m.media-amazon.com/images/I/81W5Pwk8icL.jpg)
![DionoRadian 3RXT SafePlus, 4-in-1 Convertible Car Seat, Rear and Forward Facing, SafePlus Engineering, 3 Stage Infant Protection, 10 Years 1 Car Seat, Slim Fit 3 Across, Black Jet - Image 5](https://m.media-amazon.com/images/I/81osBI9Rr3L.jpg)

## Available Options

This product comes in different **Color, Style** options.

## Questions & Answers

**Q: How do you adjust the head support up or down?**
A: You have to pull each side towards you and up. It’s very awkward. There is a youtube video that shows you how to do it.

**Q: How tall does your child have to be to start using the adjustable headrest?**
A: Your child must be using the 3rd harness slot, and the bottom of the headrest assembly must line up the child's jaw line. If these two factors are not met you must leave the headrest assembly in it's highest position until both of these factors are met.

**Q: If child exceeds latch weight limit, and seatbelt is used to secure diono, what belt can you use for booster? i’m confused??!**
A: The seat can be installed with the SuperLATCH in booster mode as you are not holding the child in with the SuperLATCH, the vehicle seat belt will be holding the child in.

**Q: Is this model Approved to go on a plane for traveling?**
A: Yes if it is in harness mode, not as booster mode

## Customer Reviews

### ⭐⭐⭐⭐⭐ Heavy, but easy to install
*by D***Y on June 4, 2025*

Bought 3 of these for my kids age 3, 4, and 11 months. Pretty easy to install, they don’t move at all when I try to shake them in the car. The cushion where they sit is super comfortable and soft. We were a little confused on where the cup holders go but eventually figured it out. Only complaint is the weight! They are pretty heavy. I also like that they can fold down and fit in small spaces.

### ⭐⭐⭐⭐⭐ Saved my sons life
*by S***R on June 2, 2025*

Believe me when i tell you that you get what you pay for! I nearly didnt purchase this seat as the price was steep, but something told me to do it anyway. Not long after, i was involved in a horrific accident on an interstate that ultimately sent my car rolling 3 times and my infant didnt even have a scratch on him. Every first responder there asked me about this carseat! I truly believe it saved my sons life. 10/10 recommend anything DIONO brand!

### ⭐⭐⭐⭐⭐ Best carseat ever!
*by M***L on May 31, 2025*

Great carseat sturdy built has some weight to it! You can strip the covers off easy to wash and keep clean!

## Frequently Bought Together

- Diono Radian 3RXT SafePlus, 4-in-1 Convertible Car Seat, Rear and Forward Facing, SafePlus Engineering, 3 Stage Infant Protection, 10 Years 1 Car Seat, Slim Fit 3 Across, Black Jet
- Diono Ultra Mat Complete Back Seat Upholstery Protection from Child Car Seats and Pets, Crash Tested, Premium Ultra Thick Padding, Durable, Water Resistant, Anti-Slip, 3 Mesh Storage Pockets

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**Shop now:** [https://www.desertcart.com.au/products/489083175-dionoradian-3rxt-safeplus-4-in-1-convertible-car-seat-rear](https://www.desertcart.com.au/products/489083175-dionoradian-3rxt-safeplus-4-in-1-convertible-car-seat-rear)

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-02-28*