Can you rear face this seat without a tether using a lap and shoulder belt?

Hi Jess, thank you for your inquiry, the Diono 3R can be installed with Isofix or a three-point seat belt rear-facing a tether is not required however we strongly advise using this, please contact your nearest store in regards to installation. We hope this helps. 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.