Would this fit a britax flexx?

Hi Abbey, thank you for your inquiry, the Outlook shade a babe is a universal fit uv cover and will fit most 3-4 wheeled buggys, it should fit the Flexx. 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.