High density foam composition. Easy clean. High density foam construction prevents depression damage. Bottom tray keeps car seat level. Deep lid of bottom tray keeps Seat Saver in correct position. Kick plate protects upholstery from shoe scuffs. Fits all automobiles. ISOFIX compatible. Stage 1: Bottom tray is used alone with rear facing infant seats. Stage 2: Back attaches to the bottom tray for use with forward facing toddler and booster car seats. Size 54.7 x 6.5 x 22cm. Complies with heat test and colour fastness standards.