Special Memory Foam Formula Memory foam creates a comfortable sleep surface, conforming to the curves of the body to create an individualized experience that aligns the spine and eliminates pressure points. This LUCID mattress topper features 3 inches of a specialized memory foam formula that is incredibly plush, airy and responsive. Gel Infused for Temperature Control LUCID infused plush memory foam with a gel material that regulates temperature for improved comfort. The gel material captures and distributes body heat to prevent overheating. Ventilated Design Improves Airflow A comfortable sleep surface is not only soft, but also breathable. Hundreds of evenly sized and space ventilation holes allow air to flow through the mattress topper for a more comfortable climate.