| 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
Cosco does not sell this seat on Amazon. See its own site for photos.
A 2-in-1 booster seat with 2 modes: high-back belt-positioning booster 40 to 100 lb, 43.4 to 57 in; backless belt-positioning booster 40 to 100 lb, 43.4 to 57 in.
Cosco lists this seat on its US site. Buy from Cosco or an authorized retailer, and confirm the exact model number before you buy.
This seat covers 2 stages, and a child has to meet every limit of the stage they are in. Cosco 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 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.

Cosco does not publish a width for this seat, so measure your back seat and compare it with the seat in a store before buying.
Sonic Diamonds, Spindrift, Violet Diamonds.
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 |
|---|---|---|---|---|
| Pronto! Trend Belt-Positioning Booster Car Seat (this seat) | 100 lb | — | — | 10 years |
| Finale 2-in-1 Booster Car Seat | 100 lb | — | — | 10 years |
| Finale DX 2-in-1 Booster Car Seat | 100 lb | — | — | 10 years |
| Rise LX Booster Car Seat | 100 lb | — | — | 10 years |
| Topside Booster Car Seat (BC214) | 100 lb | — | — | 10 years |
| Topside Booster Car Seat (BC030) | 100 lb | — | — | — |