Tether in the middle seat

Hi Karen, thank you for your enquiry, the Diono R100 can be used with the 3 point seat belt, Isofix or the Teather strap, the Teather strap is optional, however, we would suggest either calling or popping into your local Baby On The Move Store so one of our trained car seat technicians can give you any advice or can install this seat for you correctly. We hope this helps. ?For further information on this or any of our other products available, if you follow the link https://www.babyonthemove.co.nz/store-locations/ this will take you to our online store finder. Here you can find contact details for your nearest Baby On The Move Store where one of our team experts will be happy to assist you in your product search and help answer any further questions you may have. We hope this has helped with your query.