Child car seat series cybex silver carry weight 9 36 kg age 9 months 12 years group 123 with isofix side impact protection harness system impact cushion exterior measurements 45 5 x 47 x 72 89 weight 11 kg headrest function tiltable headrest adjustable backrest height adjustable adjustable headrest 11 x colour black seat reducer manufacturer specific features lsp system slip cover washable cover