Which sheet sets are most compatible with this mattress?

Hi JMck, thank you for your inquiry, this mattress fits most of the cot sheets we have available. I have added a link here: https://www.babyonthemove.co.nz/index.php?route=product/search&search=cot%20sheets. 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.