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Diono Radian 3QXT SafePlus Convertible Car Seat
Diono Radian 3QXT SafePlus Convertible Car Seat
Regular price
$449.99
Regular price
Sale price
$449.99
Unit price
/
per
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The Diono Radian 3QXT Convertible Car Seat is the ultimate 3-across, all-in-one car seat. It transitions from infant car seat to booster seat and features advanced 4-in-1 newborn protection and all new Safe+ engineering to provide the next generation in car seat safety.
You'll love that is can grow with your child for ten years--from 4 to 120 lbs--and your child will love how comfortable it is, with tons of features to ensure maximum comfort, including a contoured,12-position headrest and Comfort+ memory foam cushioning.
Best Price Guarantee
Best Price Guarantee
If you find a lower price on any item that we sell, we will gladly match it. We understand that caring for a baby isn’t cheap and that baby gear and supplies quickly add up.
The product must be the exact same color/style/size and be in stock on competitor’s website. Unfortunately, we cannot price match auction-based websites and the seller must be an authorized distributor of the brand. Some brands and manufacturers are excluded from our price match policy.
The product must be the exact same color/style/size and be in stock on competitor’s website. Unfortunately, we cannot price match auction-based websites and the seller must be an authorized distributor of the brand. Some brands and manufacturers are excluded from our price match policy.
To obtain a price adjustment, please contact email
Customer Service at hello@babycubby.com
Customer Service at hello@babycubby.com

A one-time price adjustment per item will be honored
when items are purchased at full retail price and the
merchandise (of the same style, color, and size) is
discounted within 14 days of the original purchase date.
when items are purchased at full retail price and the
merchandise (of the same style, color, and size) is
discounted within 14 days of the original purchase date.
Price Match Exceptions:
Items purchased with a promo code or discount code are
not eligible for price adjustments.
Price adjustments are not provided during Black Friday or
Cyber Monday sales.
not eligible for price adjustments.
Price adjustments are not provided during Black Friday or
Cyber Monday sales.
Car Seat Returns
Car Seat Returns
You can return your car seat within 30 days if it is unopened and unused. See our full return policy here.
Easy Returns
Easy Returns
You can return your car seat within 30 days if it is unopened and unused. See our full return policy here.
Shop Confidently - Talk to our Gear Experts
Shop Confidently - Talk to our Gear Experts
Gear Experts
Our team at Baby Cubby are product and gear experts. We have certified CPST's and gear experts with hundreds of hours of hands on experience with car seats, strollers and product research. When you shop with us we are here to help and support you throughout your parenting journey for years to come, not just with this purchase.
Have Questions?
We are here to support you and help you become the confident parent you deserve to be. You can visit one of our retail stores during regular business hours to talk with a CPS tech or gear expert, or schedule a phone or video call with us.
What is a CPST?
A CPS tech is a Certified Passenger Safety Technician. Our Cubby Moms who have certified as CPS techs are specially trained on how to properly install car seats and booster seats, ensuring they know everything there is to know about keeping children safe in vehicles.
Through required continuing education courses and hours of personal research and team training, our CPS techs are able to remain up to date on the latest technical information regarding child safety.

How does a CPS tech get certified?
In order to become certified, each prospective tech must attend The National Child Passenger Safety Certification Training Program. After intensive classroom instruction, they must pass a variety of written tests, demonstrate their knowledge through hands-on skills assessments, and perform safety checks at a check-up event before becoming certified. They learn the ins and outs of car seat installation possibilities, installing car seats in different vehicles, harnessing methods, and more. The car seat and safety industry is constantly changing, so our CPS techs here at The Baby Cubby are an invaluable resource for parents purchasing a new car seat, or for ones who simply want someone to double check that their current car seat is properly installed.
Features
Features
- Adapts for 10 years of use, from infant to booster seat, rear and forward facing,
- Slim fit design for 3-across seating
- 4-in-1 newborn protection with Safe+ inserts
- Safe+ steel anti-rebound bar to reduce rebound rotation by 50%
- Steel-reinforced frame
- 8 layers of side-impact protection with side-impact management pod
- Diono SuperLATCH attachment
- One-hand, easy-adjust 12-position headrest
- Comfort+ memory foam cushion
- Machine washable cover
What's Included
What's Included
- Diono Radian 3QXT Convertible Car Seat
- Rear-Facing Base
- 4-Stage Newborn Inserts: Protection Insert, Travel High Wedge, 2-in-1 Infant Positioning Liner, Harness Pads
- Cup Holder
- SafePlus™ Steel Anti-Rebound Bar & Side Impact Management Pod
- Harness Pads and Lap Belt Cushion
Specifications
Specifications
Weight and Height Capacity
- Weight: 4-120 lbs
- Rear Facing: 4-50 lbs
- Rear Facing LATCH Maximum User Weight: 35 lbs
- Forward Facing: 22-65 lbs
- Forward Facing LATCH Maximum User Weight: 40 lbs
- Booster: 40-120 lbs
- Maximum User Height: 57.1"
Product Weight and Dimensions
- Weight: 32 lbs
- Dimensions: 28.5"H x 17"W x 16"D
- Folded Dimensions: 28.5"H x 17"W x 11.5"D
Installation Options
- Rigid LATCH
- Seat Belt Installation
Care Instructions
- Covers: Machine wash cold, line dry. Shell and Components: Spot clean
Compatibility + Accessories
Compatibility + Accessories
Accessories
- Radian Car Seat Travel Backpack
- Ultra Mat and Heat Sun Shield Car Seat Protector
- Radian Rear-Facing Angle Adjuster
- Radian XL Cup Holder - 2 Pack