Cybex Eternis S vs Diono Radian 3RXT
The Radian 3RXT is 2.8 in narrower. The Eternis S lists for $0.04 less.
Only the differences are shown.
| Cybex Eternis S | Diono Radian 3RXT | |
|---|---|---|
| Type | All-in-one | All-in-one |
| List price | $299.95Lowest price | $299.99 |
| Rear-facing weight | 4–50 lb | 5–50 lb |
| Rear-facing height | 17–48 in | 18–44 in |
| Forward-facing weight | 22–65 lb | 22–65 lb |
| Forward-facing height | 28–49 in | 30–57 in |
| Booster weight | 40–120 lb | 40–120 lb |
| Booster height | 44–57 in | 40–57 in |
| Seat weight | 26 lbLightest | 30.6 lb |
| Width | 19.8 in | 17 inNarrowest |
| Head rule | CHILD'S HEAD MUST BE 2.5 CM (1 IN) OR MORE BELOW THE TOP OF THE HEADREST OR SHELL, WHICHEVER IS TALLER. | Rear-facing: Top of head must be 1.5 in (3.8 cm) below the top of the car seat shell. Forward-facing: Top of child's ears MUST be below top of car seat shell. |
| Newborn insert | Newborn Insert (REAR-FACING ONLY); no weight limit stated | Infant head and body support cushion; infant use 5-22 lb (2.3-10 kg) per recline level indicator |
| Installation | LATCH, seat belt | LATCH, seat belt |
| Load leg | No | No |
| Anti-rebound bar | Yes | Yes |
| Rotates | No | No |
| Harness heights | 12 | Not listed |
| Recline positions | 6 | Not listed |
| Aircraft label | Certified for aircraft, per the maker | Certified for aircraft, per the maker |
| No added flame retardants | Not listed | No |
| Expires after | 10 years | 10 years |
Cybex Eternis S
A non-rotating Cybex all-in-one with a 12-position headrest that goes from rear-facing through high-back booster.
- Rear-facing to 50 lb
- Approved for aircraft use per Cybex
- In-seat recline plus 6 base recline positions
- 19.8 in wide
- 26 lb to carry
Diono Radian 3RXT
A slim steel-frame seat that folds and goes rear-facing to 50 lb, forward-facing to 65 lb and then to a high-back booster.
- Folds for travel
- Approved for aircraft use in harness mode
- Includes steel anti-rebound bar
- Heavy at 30.6 lb
- Needs 30-36 in of front-to-back room rear-facing
Eternis S or Radian 3RXT?
Answers come from each maker's published specs. Safety and health questions link to the agency or medical source.
Which is easier to travel with?
Eternis S: certified for planes, 26 lb. Radian 3RXT: certified for planes, 30.6 lb.
What does the extra $0.04 for the Radian 3RXT get you?
No extra listed feature from the ones we track (load leg, anti-rebound bar, rotation, flame retardants). Compare fabrics, ease of install, and fit in your car. Both meet the same federal crash standard.
Still wondering? Write to us at hello@cribpicks.com and we'll look it up.