KidShortlist
Diono · High-back booster

Diono Radian 3RXT Safe+

Based on 1 independent scored test: Insurance Institute for Highway Safety (IIHS) (2024). The test scores average 90. With only 1 test, the ranking score is pulled down a little until more testers confirm it.

Tested for US & Canada
80
Shortlist score
Excellent
#18 of car seats for US & Canada
Single test

Where to buy

This seat is certified for US & Canada. Car seats may only be used in the market they're approved for, so we don't link to shops in Czechia.

Test results

Each score as the tester published it, converted to our 0–100 scale. Weight is how much the result counts towards the score.

Insurance Institute for Highway Safety (IIHS) US · Lab test
IIHS booster ratings: new booster models for 2024 (released Jan 24, 2024) · highback
BEST BET
Best Bet
Our scale90
weight 1.00
Tested model #50103-NA-01; results also apply to 50100-NA-01, 50101-NA-01, 50104-NA-01, 50105-NA-01; seat type: Highback only; also on final IIHS ratings list (https://www.iihs.org/api/boosters/all-ratings); rating covers booster-mode belt fit only (IIHS does not rate harness modes)
View on iihs.org ↗

Top-ranked alternatives

How we turn these into one number: methodology. Tested in 2024.

KidShortlist

We don't test products ourselves. Every score here comes from an independent tester and links back to it. We combine 4,061 results from 26 sources.

Read before buying

Several testers are paywalled, so we only include what they publish openly. Models change and get recalled. Check the tester's own page and the retailer listing before you buy.

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