DionoRadian 3 RX All-In-One Convertible Car Seat


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color: Pink



What weabout it
Ride rear facing for longer and fit three in the back with this super-safe seat.

About this Product
  • Fits 3 across in most mid-size cars
  • Fully integrated steel frame
  • Folds for storage or travel
  • Extended rear-facing use: up to 45 lbs
  • Forward facing in a 5 point harness up to 65 lbs
  • Converts to a booster for children 50 to 120 lbs


Diono’s convertible car seats are top tier—they are super safe and will see your child from infant to big kid (really big!). The company’s Radian seats are made to fit three across in most mid-sized back seats—a huge plus for 3+ kid families, or for families who just want more space in the back seat. The 3RX is the midpoint model in the Radian line. Your child can ride in it rear facing for longer than the less-expensive Radian 3R, but it doesn’t have the added head support of the Radian 3RXT.

Safety-wise, the Radian 3RX is engineered above all else to protect your child. The steel-alloy frame has aluminum reinforced sidewalls—this solid, metal construction really makes this car seat stand out from the competition. On top of this, the seat is lined with EPS foam and has a patented Safe Stop harness to absorb shock in case of a crash.

As an important measure of safety, your child can ride in the rear-facing position (the safest one) in this seat up to 45 pounds (Diono’s Radian RXT seats is rated even higher). Once your child outgrows the rear-facing seat, turn it around for a front-facing car seat with a 5-point harness, and then convert it to a high-backed, belted booster seat. In theory, your child can ride in the booster up to 120 pounds—that’s more than most kids will need, yet still a reassuring safety rating. For newborns and smaller babies, the seat comes with plush head and body support cushions, so you could skip the infant car seat and just use this one if you like. The expiration date on this seat is 10 years, about 2 to 4 years longer than most seats, so it really can see you through your child’s first decade.

The Radian 3RX comes in high-quality fabrics with covers you can remove and machine wash (you’ll need to rethread the harness to get the cover off and on). It also has the distinction of being foldable. Yes, you read it right. The seat folds flat for storage or travel (the company sells a shoulder/backpack strap that can come in super handy for travel). On top of that, it’s FAA rated for use on an airplane.

Drawbacks? Because of its steel frame, this is a super-heavy seat, weighing in at 26.8 pounds. Usually you’ll be keeping your car seat in one place, so the weight is a non-issue. But if you need to move it around a lot, the weight becomes a consideration. And though this seat is compact from side to side, it takes up a lot of space in the car from front to back when installed angled back in the rear-facing position (front facing is just fine). You can purchase a separate angle positioner to help with this, but it may still be an issue when installed rear-facing in more compact cars or on an airplane.


  • Dimensions without cover: 28.35” x 16.93” x 16.14”
  • Car seat weight: 26.8
  • Rear-facing range: 5–45 lbs or 44”
  • Forward-facing range: 20–65 lbs or 30”–57”
  • Booster weight range: 50–120 lbs
  • Fits three across in the back seat of most mid-size cars
  • Memory foam padding
  • Folds flat for travel
  • FAA certified
  • Rear-facing tether capability
  • Expandable sides
  • Low-sitting profile
  • Angled cup holder
  • Machine washable cover
  • 10-year life

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