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Head to head · Car Seats

Radian 3R, 3-in-1 Convertible Car Seat vs Slimfit 3-in-1 Convertible Car Seat

Ravvy scores Radian 3R, 3-in-1 Convertible Car Seat at 86.09 and Slimfit 3-in-1 Convertible Car Seat at 92.12. Slimfit 3-in-1 Convertible Car Seat takes the overall pick, best for growing families with compact suvs or multiple children.

Diono Radian 3R, 3-in-1 Convertible Car Seat, Rear Facing & Forward Facing, 10 Years 1 Car Seat, Slim Fit 3 Across, Jet Black Radian 3R Fits 3 Across Black Jet
86.1

$200

This is the definitive choice for growing families needing to fit three children across a single row, provided they can manage its heavy steel frame and technical installation process.

Ravvy pick

Graco Slimfit 3-in-1 Convertible Car Seat, Slim Car Seat with Space-Saving Design, Highback Booster Seat with 10-Position Headrest, Rear Facing and Forward Facing Carseat, Jarret Jarret SlimFit
92.1

$230

A reliable long term investment for parents who value cabin space and ease of adjustment over ultra premium luxury fabrics.

How they score

FactorRadian 3R, 3-in-1 Convertible Car SeatSlimfit 3-in-1 Convertible Car Seat
Longevity9495
Portability72–
Ease of cleaning84–
Space efficiency98.5–
Safety construction96–
Ease of installation65.5–
Space Saving–88.5
Child Comfort–89
Safety Features–93.5
Installation Ease–85

Radian 3R, 3-in-1 Convertible Car Seat

Skip it if parents who frequently switch the seat between different vehicles

Slimfit 3-in-1 Convertible Car Seat

What owners praise

  • Rotating cup holders save nearly two inches of width
  • No rethread harness makes height adjustments effortless
  • Steel reinforced frame adds significant structural integrity
  • Transitions through three modes for decade long utility
  • Washable seat pad is easy to remove for cleaning

What to know first

  • Slightly heavier than basic non reinforced models
  • Cup holders must be rotated inward to achieve maximum slimness
  • Bulkier than dedicated narrow profile specialty seats

Skip it if parents who need to fit three seats across a very small sedan

Specs side by side

SpecRadian 3R, 3-in-1 Convertible Car SeatSlimfit 3-in-1 Convertible Car Seat
UPC677726506200047406190652
ASINB083F5P7VPB0DHM53GZC
BrandDionoGraco
ColorBlack JetJarret
Unit Count1 Count1 Count
Item Weight23 pounds19.5 pounds
OrientationConvertible SeatForward Facing
Part Number506202215460
Harness Type5-Point5-Point
ManufacturerDionoNewell Brands
Model Number506202215460
Material TypeAlloy Steel, Plastic, Polypropylene, PolystyrenePolyester

Other options in this category

Britax One4Life All in One Car Seat, Up to 10 Years of Use — Mineral Gray Mineral Gray One4Life
95.1

Best for safety conscious parents who want a single high quality seat to last from birth to middle school

  • 10 year lifespan from 5 to 120 pounds
  • Built-in cooling channels for airflow
  • Steel reinforced frame
$440
Graco Extend2Fit Convertible Car Seat, Rear and Forward Facing Car Seat with Adjustable Extension Panel for Extra Legroom, Great Gift for Baby Shower or Baby Registry, Gotham Gotham 2.0 2-in-1
94.1

Best for parents prioritizing extended rear-facing safety for taller children.

  • 4-position extension panel
  • 10-position headrest height
  • ProtectPlus Engineered safety
$240