Hi Sandra,
Thank you for your enquiry on our website.  The type of mattress you are referring to is called a zip and link, however, these are only available in king size and above.

I hope this was helpful and if you would like any further information of would like to discuss the suitability of any of our mattresses please do not hesitate to contact the office on 0161 437 4419.  Our office hours are 8 am – 8 pm Monday to Friday and 10 am – 4 pm Saturday and Sunday

Kind Regards

Michaela