BioPEDIC 6" Back to Campus Memory Foam Mattress, Twin XL Base layer of 4.5-inch of heavy-duty foam creates a durable and supportive foundation for the top layer of 1.5-inches of breathable open-cell memory foam Conforms to your body's contours whether you are on your side, back or stomach Open-cell memory foam with heat dissipation layer that sweeps heat away allowing for a cooler and more comfortable sleep Twin XL mattress measures 80-by-39 inches Four-year Soft-Tex manufacturer's warranty Made without ozone depleters. Made without PBDEs, TDCPP or TCEP (&#039;Tris) flame retardants. Made without mercury, lead, and other heavy metals. Made without formaldehyde. Made without phthalates regulated by the Consumer Product Safety Commission. Low VOC (Volatile Organic Compound) emissions for indoor air quality (less than 0.5 parts per million).