Angle Adjuster positions rear-facing Radian seats at a more upright angle for older children and can add up to 4” more room behind the front seats for more front leg room. The dense foam construction adds firm, lateral support for increased stability. Angle Adjuster fits all model Radian seats and is LATCH compatible. For use only with rear-facing Radian seats and with child who has complete head control and can sit up unassisted. Crash tested.