The subject invention provides a foamed article having random cell structures formed by a process comprising the steps of providing a resin component and an isocyanate component and providing a first nucleation gas and a second nucleation gas, both under low pressure. The first and the second nucleation gases are added into at least one of the resin component and the isocyanate component. The resin component and the isocyanate component are reacted to form the foamed article having a first cell structure resulting from the addition of the first nucleation gas and a second cell structure that is different than the first cell structure resulting from the addition of the second nucleation gas. The foamed article is particularly suited for replacing metal springs in an article of furniture while still maintaining the feel and comfort of the metal springs.