Compatible with Mountain Buggy Terrain?

Hi Nicola,  Thank you for your enquiry, There are adapters that will be suitable to use with your Maxi Cosi and Mountain Buggy however you will need to go see your local Mountain Buggy Stores. 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.