Hi Camilla, Thank you for your enquiry. The Evenflo Nuture Infant capsule has a path within the base that the seat belt feeds through. This is then fastened by the seat belt clip as usual, accompanied by an extra locking clip to secure. We would recommend contacting your nearest Baby On The Move store to speak with one of our expert Child Restraint Technicians direct. They will help to install this seat for you and answer any questions you may have along the way. To find your nearest store follow the link https://www.babyonthemove.co.nz/store-locations/. We hope this has helped with your query.