This CertiPUR-US Certified Hybrid mattress is designed to provide a firm comfortable feel, a deep level of support, and a long lasting and consistent night's sleep. The individually wrapped Quantum innerspring system will reduce motion transfer and provide an individualized level of comfort. The Quantum edge coil 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" Cool Gel Foam that will help dissipate heat and improve air flow throughout the mattress. Twin XL = 79" L and 10.5" Profile Deep.