Diono is recalling certain Radian R100, Radian R120, Radian RXT, Olympia, Pacifica, and Rainier convertible and booster car seats. When the seat is installed in the forward facing position and secured to the car using the lap belt without also using the top tether, the seat may not adequately protect the child from injury in the event of a crash. As such, these child seats fail to conform to the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 213, “Child Restraint Systems.” Only seats manufactured between November 25, 2013, and September 5, 2017, are affected by this recall campaign.