Diono Radian 3RXT
Carseat NameRadian 3RXT
CarseatBlog Recommended SeatYes
Recommended Carseats
IIHS Best Bet Booster
Available atBuy at Amazon.com
Available in Canada
RF Weight Limits5-45 lbs.
RF Height LimitsUp to 44 in. with at least 1.5 in. of shell above head
FF Weight Limits20-65 lbs.
BPB Weight Limits50-120 lbs.
Age Limits
Type of Energy-Absorbing FoamEPS foam
Carseat NameRadian 3RXT
No Re-thread Harness?
Number of harness height positions5
Bottom/Lowest Harness Slot9 in.
2nd Harness Slot or Highest Harness Slot10.5 in.
3rd Harness Slot12 in.
4th Harness Slot15 in.
5th Harness Slot17 in.
Highest BPB Shoulder Belt Guide
Booster ModesHighback
Closest Buckle Slot3.5 in.
2nd Buckle Slot5.5 in.
3rd Buckle Slot7 in.
Special Buckle Routing for Small Babies
Carseat NameRadian 3RXT
Inside Shoulder Width14 in.
Inside Hip Width
Inside Knee Width14.5 in.
Inside Seat Depth13 in.
Inside Seat Height
External Widest Point17 in.
Seat Weight27 lbs.
Carseat NameRadian 3RXT
Recline Indicator StyleNone
Recline Indicator Location
Number of RF Recline Positions1
Number of FF Recline Positions2
Has Anti-Rebound Bar or RF Tether?
RF Lockoff
FF Lockoff
Type of LATCH ConnectorsSuperLATCH
RF LATCH connectors/belt path are separate from RF seat belt/belt path
FF LATCH connectors/belt path are separate from FF seat belt/belt path
LATCH Weight Limit35 lbs. rear-facing, 40 lbs. forward-facing
Non-standard LATCH Policy (can “borrow” LATCH anchors)Permitted if allowed by vehicle manufacturer and the bars are between 11″ and 14” apart
Inflatable Seat Belt PolicyAllowed
Carseat NameRadian 3RXT
Cover Removal/InstallationEasy
Cover Washing InstructionsHand wash and air dry
Expiration10 years
Crash GuidelinesReplace after any crash
FAA Certified?
CommentsSee our review for why CarseatBlog doesn’t recommend the RXT as a booster
O Canada22-65 lbs. FF
Manufacturing CountryChina
CarseatBlog.com ReviewRadian 3RXT Review
Available AtBuy at Amazon.com
Price or MSRP$299.99