Narrow / 3-across booster car seats
Booster seats that carry the narrow / 3-across spec — 6 models to shortlist from.
🛟 Fit is decided by your seat manual + your vehicle manual. This page lists published specs to help you shortlist — it is not installation or safety advice, and it does not confirm a seat fits a specific car. Confirm install with the manuals, NHTSA, or a free certified car-seat technician (CPST) check.
| Car seat | Stage | Narrow (3-across) | Ext. rear-facing | FAA | Lightweight | Buy |
|---|---|---|---|---|---|---|
| Clek Oobr | Booster | ✓ | – | – | – | Amazon → |
| mifold Grab-and-Go | Booster | ✓ | – | – | ✓ | Amazon → |
| Graco RightGuide Portable | Booster | ✓ | – | – | ✓ | Amazon → |
| Diono Monterey 4DXT | Booster | ✓ | – | – | – | Amazon → |
| Clek Ozzi | Booster | ✓ | – | – | ✓ | Amazon → |
| Diono Solana 2 | Booster | ✓ | – | – | ✓ | Amazon → |
These are the slim models families use for 3-across — but three fit only if their combined width fits your vehicle's bench, so test-fit in YOUR car.
More: all booster seats · all narrow / 3-across seats · how to check fit →