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CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
Price on Amazon.com as of 2026-11-02 09:12 UTC, and subject to change.
An all-in-one car seat with 3 modes: rear-facing harness 5 to 40 lb, 19 to 40 in; forward-facing harness 30 to 65 lb, 34.4 to 49 in; belt-positioning booster (high-back) 40 to 100 lb, 43.4 to 52 in.
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CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED ‘AS IS’ AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
The Maxi-Cosi Pria Max+ is a 3-mode all-in-one seat: rear-facing harness for 5 to 40 lb and 19 to 40 in., forward-facing harness for 30 to 65 lb and 34.4 to 49 in., and high-back booster for 40 to 100 lb and 43.4 to 52 in. It shares the Pria manual, which sets a 10-year life.
The Pria Max+ suits parents who want the Pria limits with the ClipQuik magnetic chest clip and a snack holder, and who do not need a backless mode. It shares one manual with the Pria and Pria Max, so the installation rules and limits are the same across all three. The differences are in the extras: the Max+ page lists a spill-proof snack lid and a cup holder that takes a two-handle sippy cup, and the Pria Max page lists 2 dishwasher-safe cup holders without those extras.
A research summary of Maxi-Cosi’s published specifications and manual, read . Not a hands-on test or a crash-safety rating.
This seat covers 3 stages, and a child has to meet every limit of the stage they are in. Maxi-Cosi gives it a 10-year life from the date of manufacture, so check the date label before using a hand-me-down.
| Mode | Child weight | Child height | Minimum age | Conditions |
|---|---|---|---|---|
| Rear-facing harness | 5 to 40 lb | 19 to 40 in | Not published | — |
| Forward-facing harness | 30 to 65 lb | 34.4 to 49 in | Not published | — |
| Belt-positioning booster (high-back) | 40 to 100 lb | 43.4 to 52 in | Not published | — |
A child must meet every limit for the mode they use. The labels on your seat and its manual are the final word.
Every install is a fit between one seat and one vehicle. Read both manuals, and use a free inspection station if anything is unclear.
Maxi-Cosi does not publish a width for this seat, so measure your back seat and compare it with the seat in a store before buying. It weighs 16.5 lb, which matters if you will move it between cars or carry it through an airport.
Sea Shadow.
The Pria, Pria Max and Pria Max+ all link to the same user guide, and it covers all three by name. The weight and height limits, belt paths, recline rules and lower anchor limit are identical. Some parts are marked as being on select models only, such as the harness covers and the side pocket harness holders. So the choice between them comes down to the extras on each product page, not to how long the seat lasts or how it installs.
Source: Maxi-Cosi Pria, Pria Max and Pria Max+ user guide (PDF)
Rear-facing, you install with either the vehicle belt or the lower anchor belt, never both, and the tether is stored. Forward-facing, the seat goes in Position 1 and the tether must always be used when anchors are available. The lower anchors are not for a child over 50 lb; above that, the vehicle belt is required for a child up to 65 lb. The seat should not move more than 1 in. side to side at the belt path. A rear-facing seat behind another seat must touch it or be as close as possible.
Source: Maxi-Cosi Pria, Pria Max and Pria Max+ user guide (PDF)
The seat has 3 positions. Rear-facing uses Position 3 or 2, Position 1 is not allowed rear-facing, and forward-facing and booster modes use Position 1. For a child of 5 to 30 lb and 19 to 34.3 in., the bottom level line must be parallel with the ground; for 30 to 40 lb and 34.4 to 40 in. and sitting up unassisted, the top line applies. When using the lower shoulder harness slots for smaller children, the manual requires the head and body pillows together and the headrest in its lowest position.
Source: Maxi-Cosi Pria, Pria Max and Pria Max+ user guide (PDF)
Each campaign naming this family was read against this model’s numbers and build dates, and none covers it. Still check your seat’s model number and date of manufacture before use, especially on a used seat.
Both share the same manual and limits. The Pria Max+ page lists a cup holder that can hold a two-handle sippy cup and a snack holder with a spill-proof lid.
Yes. The product page says the infant head and lumbar inserts have extra plush padding and can be removed without rethreading the harness.
Yes. The product page lists ClipQuik, a magnetic chest clip that opens with 1 hand, along with QuikFit adjustment without rethreading and 3 reclining positions.
The shared Pria manual says it is certified for aircraft use with the internal harness, but not as a booster, because aircraft seats have no shoulder belts. Install it in a window seat and use it only on forward-facing aircraft seats.
Maxi-Cosi Pria, Pria Max and Pria Max+ user guide (PDF) (opens in a new tab)
Machine wash the pad separately in cold water on a gentle cycle, without bleach, and tumble dry separately for 10 to 12 minutes on low heat. You do not need to remove the harness system to take the pad off, but the manual warns never to pull the harness strap fully out of the seat.
Maxi-Cosi Pria, Pria Max and Pria Max+ user guide (PDF) (opens in a new tab)
Answers refer to the model and manual version on this page. Check the instructions supplied with your seat.
| Model | Top child weight | Seat weight | Width | Usable life |
|---|---|---|---|---|
| Pria Max+ All-in-One Convertible Car Seat (this seat) | 100 lb | 16.5 lb | — | 10 years |
| Sela All-in-One Convertible Car Seat | 100 lb | 27.25 lb | — | 10 years |
| Kani 4-in-1 Convertible Car Seat | 100 lb | 23.2 lb | — | 10 years |
| Pria Max All-in-One Convertible Car Seat | 100 lb | 16.8 lb | — | 10 years |
| Pria All-in-One Convertible Car Seat | 100 lb | 16.5 lb | — | 10 years |
| Petra All-in-One Convertible Car Seat | 100 lb | 14.75 lb | — | 10 years |
| Romi 2-in-1 Convertible Car Seat | 50 lb | 9.2 lb | — | 10 years |
Other all-in-one seats whose published weight and height limits overlap the Pria Max+ All-in-One Convertible Car Seat.
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–40 lb | 19–40 in |
| Forward-facing harness | 30–65 lb | 34.4–49 in |
| Belt-positioning booster (high-back) | 40–100 lb | 43.4–52 in |
$269.99Sea Shadow · Amazon price as of 2026-11-02 09:12 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–40 lb | 19–40 in |
| Forward-facing harness | 30–65 lb | 34.4–49 in |
| Belt-positioning booster (high-back) | 40–100 lb | 43.4–52 in |
$329.99Esgargot · Amazon price as of 2026-11-02 09:12 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–40 lb | 19–40 in |
| Forward-facing harness | 30–65 lb | 34.4–49 in |
| Belt-positioning booster (high-back) | 40–100 lb | 43.4–52 in |
| Backless booster | 40–100 lb | 43.4–57 in |
$379.99Caspian Caviar · Amazon price as of 2026-11-02 09:12 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| Rear-facing harness | 5–40 lb | 19–40 in |
| Forward-facing harness | 30–65 lb | 34.4–49 in |
| Belt-positioning booster (high-back) | 40–100 lb | 43.4–52 in |
$229.99Sea Shadow · Amazon price as of 2026-11-02 09:12 UTC, subject to change
