Vispring luxury mattresses are available in four spring tensions to suit individual needs. If one tension does not suit both yourself and your partner, a combination mattress might be perfect for you (available in 150cm and larger). A combination mattress allows you to have two different tensions, for example, one side medium and the other side firm. If there is a bigger difference in tension preferences, a zip and link mattress could be better suited. This would allow you to zip together two smaller mattresses in different tensions, for example, soft and extra firm.