You can buy the ARB separately if you want still with the Poplar. I wouldve preferred the Poplar S but needed a natrow carseat right away and was assured i could later purchase an ARB. Unfortunately it was more expensive to do it that way and i dodnt get that nicer padding either. So if you decide later you want an ARB Britax customer service can sell it to you but its more cost effective to buy the S model. Honestly I feel gypped and frustrated, if the Poplar was released when it was supposed to be originally i probably couldve had the S in time for my child to use it upon outgrowing her infant seat. It feels like a cheaper seat too vs our One 4 Lifes in our wider car. The whole thing has kind of soured me on Britax carseats, I dont think I'd buy another one, certainly not a convertible.
