Best Most Narrow Booster Seat

Safety 1st EverSlim 4-in-1 Convertible All-in-One Car Seat, infant to toddler, rear and forward facing, booster mode, backless booster, Fits 3 across, Washable seat, Birth to 10 years, Hexagon Horizon

BRITAX Highpoint Backless Belt-Positioning Booster Seat, SafeWash Black Ombre

Graco Turbobooster Backless Booster Seat, Gust

Britax Grow With You ClickTight Harness-2-Booster, Cool N Dry

Chicco GoFit Plus Backless Booster Car Seat with LATCH Attachment and Quick-Release LATCH Removal, Portable Travel Booster Seat for children 40-110 lbs. - Avenue/Black & Charcoal Grey

Cosco Kids Topside Lightweight Backless Belt-Positioning Booster Car Seat, Washable Cover, Diamond Daze

Diono Solana 2022, No Latch, Pack of 2 Backless Booster Car Seats, Lightweight, Machine Washable Covers, Cup Holders, Black Charcoal

Evenflo Maestro Sport Harness Booster Car Seat (Aspen Skies Gray)

Safety 1st Grow and Go Arb 3-In-1 Car Seat, Grey/Teal

Chicco GoFit Backless Booster Car Seat, Travel, Portable Car Booster Seat for children 40-110 lbs. - Knight/Black, 1 Count (Pack of 1)