Cooler than traditional memory foam, the 4" Thomasville® Gellux®mattress topper helps you stay comfortable throughout the night. State-of the art-process combines cooling liquid gel with contouring comfort foam to provide pressure relieving support and greater overall cooling. Separated into a multi-zone foam design, the topper provides additional support in the lumbar section in order to relieve pressure where you need it most. The sleep wave design creates space for refreshing airflow and pressure relieving comfort while vertical perforations increase ventilation to help reduce heat build up.