Hi Mrs Harrison,

Thank you for your question.

Unfortunately this is not something that i know for sure, however when searching their official site there is not an option to search for toppers which would lead me to believe that they do not sell them separate to the mattresses.

I would recommend contacting a showroom the has Hypnos models on display and ask them too as they may know for certain.

If you would like to discuss our John Ryan mattress toppers please feel free to give the office a call on 0161 437 4419.

Kind regards,
Amy