Good morning Alex,
 
Thank you for your question.
 
All the mattresses in the Artisan Range do have fire retardant sprayed on to the outer cover and this process is done before it arrives at our Factory.   I have attached a link from our website which explains the details with regard to this process and the reason why this regulation has to be complied with.
 

 
I hope this assists but if you do require any further assistance or information, please do not hesitate to contact our office on 0161 437 4419.
 
Kind regards Julie