This CertiPUR-US Certified Hybrid mattress is designed to provide Medium Density, a comfortable feel, and a deep level of support for a long lasting and consistent night's sleep. Â The individually wrapped Quantum innerspring system will reduce motion transfer and provide an individualized level of comfort. The Quantum edge coilÂ design will allow the sleeper to use 100% of the mattress's surface, going to the edge without rolling off. These special functions do not sacrifice comfort or support, rather add to it. This durable mattress also has the valuable feature of 1" Cooling Gel Foam and 2" of Serene Foam that will that will help dissipate heat, improve air flow throughout the mattress, and allow for enhanced support reducing pressure points on key areas of the body. Twin XL Mattress = 79" L and 11.5" Profile Deep.