The Flexcell memory foam topper is constructed from complete 55kg density memory foam measuring 6cm with a summer side & winter side using only the best in British visco elastic. The Summer side is built using an egg box style construction to provide great ventilation between you & the overlay. This airflow will keep you cool & keep the overlay fresh & well ventilated. The Winter side offers a flat surface of pressure relieving material, taking the edge off a sometimes hard mattress giving you a great nights sleep. the cover is a soft damask material & removable for washing.