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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 00:51 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. Its manual, shared with the Pria, sets a 10-year life.
The Pria Max suits parents who want the Pria limits plus the ClipQuik magnetic chest clip and spring-assist harness holders that keep the straps aside while loading the child. The limits and installation are the same as the Pria and Pria Max+, because all three share one manual. If you want a backless mode or more recline positions, the Kani 4-in-1 is the sibling to compare.
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 16.8 lb, which matters if you will move it between cars or carry it through an airport.
Caspian Caviar, Oyster Shell, Escargot.
Maxi-Cosi's Pria Max page lists two extras for getting a child in and out: the ClipQuik magnetic chest clip, which opens with 1 hand, and the Out-of-the-Way spring-assist harness holders. It also lists 3 recline positions, 2 removable dishwasher-safe cup holders, 1-click LATCH and certification for airplane use. The page also says the infant head and lumbar inserts can be removed without rethreading the harness.
Source: Maxi-Cosi Pria Max product page
In each direction you use either the vehicle belt or the lower anchor belt, never both. Rear-facing, the tether stays stored and the seat must touch the seat in front or be as close as possible. Forward-facing, the seat is fully upright 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, so a heavier child up to 65 lb needs the vehicle belt. The seat should move no more than 1 in. at the belt path.
Source: Maxi-Cosi Pria, Pria Max and Pria Max+ user guide (PDF)
The manual explains how to open the magnetic chest clip by holding both sides and separating the magnet. It also covers the optional harness covers: if they stop the chest clip sitting correctly, or prevent a tight enough harness on a smaller infant, remove them and store them until the child is big enough. The head and body pillows are for rear-facing only and must be used together. With the lower shoulder slots, both pillows are required and the headrest must be at 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.
No. The shared manual gives the same limits for all three Pria models: 5 to 40 lb and 19 to 40 in. rear-facing, 30 to 65 lb and 34.4 to 49 in. forward-facing, and 40 to 100 lb and 43.4 to 52 in. as a booster.
Maxi-Cosi Pria, Pria Max and Pria Max+ user guide (PDF) (opens in a new tab)
No. The product page says QuikFit adjusts the integrated headrest and harness without rethreading, and that the infant head and lumbar inserts can be removed without rethreading too.
The manual says not to use the lower anchors for a child weighing more than 50 lb. From then on, install it with the vehicle lap or lap/shoulder belt plus the tether, for a child up to 65 lb.
Maxi-Cosi Pria, Pria Max and Pria Max+ user guide (PDF) (opens in a new tab)
The manual says not to use the seat more than 10 years after its date of manufacture, which is on a label on the seat. It also says to replace the seat after a moderate or severe crash.
Maxi-Cosi Pria, Pria Max and Pria Max+ user guide (PDF) (opens in a new tab)
Yes, with the internal harness. The manual says it is not certified as a booster on aircraft because aircraft seats have no shoulder belts.
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 | 16.8 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 | 16.5 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 00:51 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 |
$329.99Sea Shadow · Amazon price as of 2026-11-02 00:51 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 00:51 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 00:51 UTC, subject to change
