To complement the bed base and mattress we use a top mattress. Usually they are made of various thickness and composition foam. During bed configuration we can choose top mattress from for eg. Thermoelastic foam which will additionally increase its comfort. However enhanced comfort is not always what the guest wants. Perhaps it would be better to have more diverse base of top mattresses and proposing them to individual client.
Top mattress also has a different application. No matter how good the beds will be joined there will always be a gap between mattresses which can expand during sleep. The best solution for this problem is using a top mattress in size of the joined beds.