COOL TWIST GEL MEMORY FOAM - No one likes to sleep hot, that is why use cooling gel swirled into premium memory foam. This offers enhanced airflow, heat dissipation, and contouring comfort DURABLE FOAM CORE - The Serta Foam Core at the base of the mattress delivers consistent support from edge to edge, so you're comfortably supported no matter your sleep position BREATHABLE HIGH-QUALITY MATERIALS - A soft, breathable cover promotes airflow and helps you rest and wake up refreshed while our Pillow Soft Aire foam layer offers enhanced cushioning for exceptional comfort and airflow. High quality materials give the mattress a premium look and feel and feel TRUNDLE AND BUNK COMPATIBLE - The perfect mattress for bunk beds, trundle beds, day beds and more. A comfortable choice for a kids room, dorm room or guest room SIMPLE PACKAGING AND DELIVERY - Compressed and packed neatly in a box that is delivered right to your door. Just open the box, unroll and unwind! It is normal for the mattress to take up to 72 hours to fully expand and one to two weeks to air out