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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 21:52 UTC, and subject to change.
A high-back booster seat with one mode: high-back belt-positioning booster 40 to 100 lb, 43.4 to 57 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 Tanza is a folding high-back belt-positioning booster for children 40 to 100 lb and 43.4 to 57 in. It uses the vehicle lap and shoulder belt, with optional rigid LATCH connectors to hold it in place. It is not certified for aircraft use, and the manual sets a 10-year life.
The Tanza suits a school-age child who has outgrown a harness and a family that moves the booster often, since it folds and comes with a storage bag. It is high-back only. The RodiSport has the same 40 to 100 lb and 43.4 to 57 in. limits and also converts to a backless booster, while the Tanza's product page lists a 10-position headrest against the RodiSport's 7.
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 one stage. 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 |
|---|---|---|---|---|
| High-back belt-positioning booster | 40 to 100 lb | 43.4 to 57 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.
Sea Shadow, SeaDrift, Sea Salt.
The vehicle's lap and shoulder belt hold the child; the lap belt alone is never enough. Rigid LATCH is optional. To use it, pull the handle at the front so both connectors extend, push the booster back while holding the release buttons, and check for green indicators next to both buttons. The manual says not to use LATCH if it makes the seat belt buckle hard to reach, if the buckle sits between the anchors, or if the anchors are above the seat bight. Without LATCH, keep the booster belted even when empty.
Source: Maxi-Cosi Tanza Belt-Positioning Booster user guide (PDF)
The manual lists four checks. The tops of the child's ears must never be above the top of the booster headrest. The child's head must be at least 5 in. below the roof of the car. The shoulder belt goes through the guide in the headrest and lies across the center of the shoulder and chest, not the face or neck. The lap belt runs under the lap belt path guide and lies across the hips, not the stomach. The headrest has ten height positions.
Source: Maxi-Cosi Tanza Belt-Positioning Booster user guide (PDF)
Before folding, retract both rigid LATCH connectors and remove the cup holder. For the most compact fold, the manual says to set the headrest to the third lowest position, then press the folding handle and push the backrest down until it clicks. The storage bag carries the folded seat. The seat pad set and the bag are machine washed separately in cold water on a gentle cycle, with no bleach, then tumble dried for 10 to 12 minutes on low heat. The shell is spot cleaned and never submerged.
Source: Maxi-Cosi Tanza Belt-Positioning Booster user guide (PDF)
No campaign in the current NHTSA child-restraint data names this model family, and I have not run a separate review for it. Check your seat’s model number and date of manufacture before use.
The manual gives 40 to 100 lb and 43.4 to 57 in. The child can use it until the vehicle belt fits properly without a booster or until reaching any one limit or failing the fit requirements.
Maxi-Cosi Tanza Belt-Positioning Booster user guide (PDF) (opens in a new tab)
No, the manual covers only high-back booster use. The RodiSport has the same 40 to 100 lb and 43.4 to 57 in. limits and converts to a backless booster.
No. The manual says it is not certified for aircraft use because aircraft seats do not have shoulder belts. Maxi-Cosi's product page also lists aircraft use as No.
Maxi-Cosi Tanza Belt-Positioning Booster user guide (PDF) (opens in a new tab)
The product page lists a product weight of 16.5 lbs. It does not publish width or folded dimensions.
The manual says not to use it more than 10 years after the date of manufacture, which is on a label on the bottom of the seat. It also says to replace it after a moderate or severe crash.
Maxi-Cosi Tanza Belt-Positioning Booster 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 |
|---|---|---|---|---|
| Tanza Belt-Positioning Booster Car Seat (this seat) | 100 lb | — | — | 10 years |
| RodiSport Booster Car Seat | 100 lb | — | — | 10 years |
Other high-back booster seats whose published weight and height limits overlap the Tanza Belt-Positioning Booster Car Seat.
| Mode | Weight | Height |
|---|---|---|
| High-back belt-positioning boosterfrom 4 years | 40–120 lb | 43.3–60 in |
$299.95Price on cybex-online.com as of 2026-10-07 05:43 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| High-back belt-positioning boosterfrom 4 years | 40–120 lb | 43.3–60 in |
$349.95Price on cybex-online.com as of 2026-10-07 05:43 UTC, subject to change
| Mode | Weight | Height |
|---|---|---|
| High-back booster | 40–120 lb | 38–63 in |
| Mode | Weight | Height |
|---|---|---|
| High-back booster | 40–120 lb | 38–63 in |
