The Sapphire Latex features Posturetech 620 Spring System - these are designed to provide a softer feel that gradually gets firmer as pressure increases without compromising on comfort. The springs are twice tempered, which provides greater resilience and extends the life of your mattress even more. Latex is the ultimate natural elastic material, which conforms exactly to your bodys weight and shape, providing the optimum level of support for a healthy night's sleep. The Latex allows the spinal column to rest in its natural position and your blood circulation stays optimal, so your body is able to fully relax. Latex allows for maximum breathability, essential for removing excess heat and moisture that will ensure you enjoy night after night of undisturbed sleep. Sealy Posturepedic are the only sleep systems endorsed by the world renowned Orthopedic Advisory Board.