The headrest and harness are easy to adjust to ensure a comfortable fit and the harness stays conveniently open when the child is lifted in and out. When used with a Maxi-Cosi base unit, the car seat provides a highly convenient click-and-go system. Simply lift the Pebble out of the car and place it onto a Maxi-Cosi or Quinny stroller. The Pebble is also part of the car seat family, offering up to approx. 4 years of ISOFIX safety and ease-of-use.