Best Narrow Booster Seat With Harness

BRITAX RÖMER Car Seat EVOLVAFIX, with ISOFIX, Child from 76 to 150 cm (i-Size), from 15 Months to 12 Years, Space Black

Kinderkraft Car Seat COMFORT UP, Booster Child Seat, with 5 Point Harness, Adjustable Headrest, for Toddlers, Infant, Group 1/2/3, 9-36 Kg, Up to 12 Years, Safety Certificate ECE R44/04, Navy

Graco Energi i-Size R129 ISOFIX/Top Tether Harness Booster 76-150cm (15 Months to Approx.. 12 yrs). Harness Mode 76-105cm (15 Months to 4 yrs), Highback Booster Mode 100-150cm (3.5 to 12 yrs), Meteor

BRITAX RÖMER Car seat ADVANSAFIX 2 Z-LINE, for Children from 76 to 150 cm (i-Size) with and Without Isofix, 15 Months to 12 Years, Space Black

Graco Eldura R129 Harness Booster (76-145cm - 15 Months to Approx. 12 Years). Harness mode from 15 months to approx. 4 Yrs (76-105cm), Highback mode from approx. 3.5 to 12 yrs (105-145cm), Midnight