The britax kidfix xp is suitable from 15kgs to 36kgs or 4 years to 11 years offering older children a safe and comfortable seat44 providing superior protection with the retractable isofit system that anchors the child seat directly to the car the 3 point seat belt then secures the child in the seat the new xp pad also provides added safety for your child in a frontal impact reducing the energy on your childs neck area