$350· #4
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Diono
Radian 3RXT SafePlus
The narrow-profile choice for three-across seating
The Diono Radian 3RXT is the go-to solution for families who need to fit three car seats across a single row. Its 17-inch footprint and reinforced steel frame are unmatched in the category, and the fold-flat design is a genuine travel convenience. Installation takes more effort to master, but once you dial it in the seat is rock solid.
✓ Pros
- 17-inch width is the narrowest steel-frame convertible available, ideal for three-across installs
- Aircraft-grade aluminum reinforced frame and 3 layers of side-impact protection
- Folds flat for storage and travel, a rare feature in convertible seats
✕ Cons
- Installation is more involved than competitors — tether and LATCH anchoring requires patience
- Narrower seat width can feel snug for broader-shouldered toddlers
Scores
Overall
8.5
SafetyRatings
9.1
EaseOfInstall
7.8
Comfort
8.3
Longevity
9.2
Value
8.2