Bliss Ortho Memory Foam mattress is a 24?cm adult mattress with firm orthopaedic support. Its 3-layer design - 14?cm Eco foam base, 5?cm reflex foam (foam grade 33/190), and 5?cm memory foam - is topped with a Lemon Wave zip cover, providing maximum support, pressure relief, and easy maintenance for single, double, king, or divan beds.