Best Narrow Booster Seat With Harness

Evenflo Maestro Sport Harness Highback Booster Car Seat, 22 to 110 Lbs., Granite Gray, Polyester

Graco Tranzitions 3 in 1 Harness Booster Seat

Britax One4Life Convertible Infant Car Seat, 10 Years of Use from 5 to 120 Pounds, Converts from Rear-Facing to Forward-Facing Booster Seat, Machine-Washable Fabric, Glacier Graphite

Safety 1st

Safety 1st Grand 2-in-1 Booster Car Seat, Forward Facing Car Seat with Harness, High Back Booster Seat for Car, 30-65 Pounds and Belt-Positioning Booster, Car Seats, 40-100 Pounds, Dunes Edge

Chicco MyFit ClearTex Harness + Booster Car Seat - Shadow | Black

Britax Grow with You Harness-2-Booster Car Seat, 2-in-1 High Back Booster, Quick-Adjust 5-Point Harness, Mod Black

Evenflo GoTime LX High Back Booster Car Seat

Evenflo Chase Harnessed Booster, Jubilee , 18x18.5x29.5 Inch (Pack of 1)

Graco Nautilus 2.0 LX 3-in-1 Harness Booster Car Seat ft. InRight LATCH, Hex

Safety 1st

Safety 1st Boost-and-Go All-in-1 Harness Booster car seat, 3-in-1 Booster for Extended use: Forward-Facing Harness, high-Back Belt-Positioning Booster and Backless Booster, Dunes Edge