Dive into a more rejuvenating sleep with the Aveline 8" Twin XL Mattress. Its top layer of breathable gel-infused memory foam ensures a steady, cool body climate by efficiently dispersing body heat. This mattress rapidly adjusts to your weight and posture, offering unparalleled comfort. Enjoy the benefits of this foam mattress to ease pressure points, giving relief from traditional mattress discomforts. Proudly CertiPUR-US® certified, Aveline's memory foam has been verified by independent labs to be free from fiberglass, formaldehyde, ozone depleters, mercury, and other heavy metals. This mattress ships compressed and rolled in a box, directly to your doorstep. It takes 2 to 4 hours for the mattress to expand most of the way and a day to expand fully. Includes a removable stretch knit diamond patterned cover. Box spring or foundation is optional. Slatted bases should be less than 3" apart.