| Mode | Weight | Height |
|---|---|---|
| High-back boosterfrom 4 years | 40–100 lb | 44–57 in |
| Backless boosterfrom 4 years | 40–110 lb | 44–57 in |
- Seat weight
- 10 lb
- Width
- 17 in
- Usable life
- See label
- Aircraft
- Not certified
Product images are not available right now.
A 2-in-1 booster seat with 2 modes: high-back belt-positioning booster 40 to 100 lb, 43.4 to 57 in; backless booster 40 to 100 lb, 43.4 to 57 in.
Prices and purchase links will return when a fresh, eligible listing is available. The review and manufacturer sources remain available below.
This seat covers 2 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 |
|---|---|---|---|---|
| High-back belt-positioning booster | 40 to 100 lb | 43.4 to 57 in | Not published | — |
| Backless 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, Seafaring, Sea Salt.
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.
| Model | Top child weight | Seat weight | Width | Usable life |
|---|---|---|---|---|
| RodiSport Booster Car Seat (this seat) | 100 lb | — | — | 10 years |
| Tanza Belt-Positioning Booster Car Seat | 100 lb | — | — | 10 years |