Maxi-Cosi Pria Max vs Cybex Eternis S

Both are convertible car seats — here are their published manufacturer specs side by side.

This compares published manufacturer specs — not safety or fit advice. The seat's manual, your vehicle's manual, NHTSA's tools and a certified CPST are the fit-and-safety authority; always check them before installing.

Spec	Maxi-Cosi Pria Max	Cybex Eternis S
Stage	Convertible	Convertible
Narrow (3-across)	–	–
Extended rear-facing	–	✓
FAA-approved	✓	✓
Lightweight / travel	–	–

How they differ

• the Cybex Eternis S lists extended rear-facing (a higher rear-facing weight limit, ~40-50 lb); the Maxi-Cosi Pria Max doesn't

Where to buy

Check the Maxi-Cosi Pria Max price on Amazon →

Check the Cybex Eternis S price on Amazon →

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FAQ

What's the difference between the Maxi-Cosi Pria Max and the Cybex Eternis S?
The Maxi-Cosi Pria Max is FAA-approved for aircraft; the Cybex Eternis S is extended rear-facing, FAA-approved for aircraft. Both are convertible car seats.

Which is right for my car and child, the Maxi-Cosi Pria Max or the Cybex Eternis S?
That depends on your specific vehicle and child — this page compares published manufacturer specs only, not fit or safety. Check the seat manual, your vehicle manual, NHTSA's car-seat finder and ideally a certified CPST before deciding.

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