Britax Römer KIDFIX i-SIZE is an i-Size highback booster from 100 – 150 cm (≈3.5 – 12 years).
Two Britax Midpoint Highback Booster Seats Rental – JadaBug's Kids Boutique
Britax Römer Hi-Liner High Back Booster
Britax KidFix i-size Highback Booster Car Seat, 100 - 160cm
KIDFIX III S - highback booster
iF Design - KIDFIX i-SIZE
KIDFIX i-SIZE - highback booster
Using a High Back Booster Car Seat Correctly and Safely –
Britax - Little Peas
Britax Romer Kidfix III S Moonlight Blue
Britax Romer KIDFIX SL Highback Booster Car Seat (Cosmos Black)