People weighing more than 114 kilograms wouldn’t have problems using a memory foam mattress. However, it’s important to consider the densities of the foam to make sure that it’s capable of supporting that weight. Typically, almost all memory foam mattresses have a core foam density of 1 kilogram or higher -- which is enough to carry a 114-kilogram person. If you’re about that weight, we recommend staying away from mattresses with a core foam density of less than 1 kilogram because they might lose their firmness quicker than they should.