Hi Kate,
 
Thank you for your enquiry.
 
If you zip and link set is the same spring tension in each half, you should turn one month and rotate the next month for the first twelve months to even out the settlement of the upholstery. If you have different spring tensions, unless you are prepared to swap sleeping sides, you can only flip head to toe. Full details of how to care for your mattress are provided here.
 
We trust that this helps, but if you require any further advice, please call our office on 0161 437 4419 and speak with one of our advisors.
 
Kind regards.