I've put a lot of time & research into our car seat purchases and these are what we love!
Versatile booster choice! High safety rating and user comfort.
Peg Perego Viaggio Shuttle Plus 120 Booster Seat
Favorite for extended rear facing! My 6.5 year old son has been in this one for 5 years and counting (rear facing until age 5). My 2.5 year old uses one as well. Slim and work for 3 across!