Increase sleep quality and personal comfort by adding one of these ventilated memory foam mattress enhancers to an existing mattress set. From Sleep Joy, the 4-inch high enhancer enables the user to enjoy the benefits of memory foam without the hefty financial commitment of a new mattress. The enhancer is crafted in ViscO2, a revolutionary, new high performance memory foam from Sleep Joy. Contrasted with many memory foams which seem to trap heat, ViscO2 permits five times as much air flow to keep the body cool and comfortable. The enhancer's design further improves head-to-toe air circulation while soundly supporting the torso with its three zones of air channels. In addition to these advances in ventilation and temperature control, the 3-pound density memory foam enhancer provides individualized support, forming to the user's unique body curves for better alignment and pressure point relief. ViscO2 is a breakthrough in memory foam technology with the same performance as the leading brand, but with 5 times greater airflow to prevent overheating. 3 zones of air channels to allow even more air circulation at the head and feet and more support in the torso area. ViscO2 + ventilation = more oxygen (O2) under the covers for a healthier, more comfortable night's sleep. A two-year limited warranty covers this item.