The Legacy Collection of Mattresses, by Therapedic, provides a quality mattress at an affordable price. The Alternating VertiCoil System is a sturdy innerspring to support you while you rest. Comfort layers include a 5-zone Convoluted Firm foam for more support in needed areas. Additional Lumbar Support is achieved with Memory Foam in the center third. A good mattress for a stomach sleeper of a back sleeper who likes a firmer feel.