The Radian Angle Adjuster positions rear-facing radian seats at a more upright angle for older children and can add up to 4" behind the front seats for more front leg room. The dense foam construction adds firm, lateral support for increased stability. The Radian Angle Adjuster fits all model radian seats and is latch compatible. For use with rear-facing radian seats and with children over 1 year of age. Made from high-density PU foam. Crash tested.