The Rainbow Plus is designed for sleepers looking for a firm orthopedic mattress with reliable and consistent support. Its combination of soy-based Bio Memory Foam, 5-zone ergonomic construction and H3 Firm support promotes healthy spinal alignment while providing stability, comfort and long-term durability. It is the ideal choice for anyone seeking a simple, durable and dependable mattress without giving up the comfort and pressure-relieving benefits of Memory Foam.