narrow twin size mattress, jingwei 5 inches cooling-gel memory foam mattress bed in a box, pressure relief & supportive, medium firm, narrow twin mattress, 30 x 75 x 5 inches jingwei jingwei 5 inch narrow twin size memory foam mattress - extra support bed, medium firm feel, certipur-us certified jingwei memory foam mattress the jingwei memory foam mattress promotes a better night’s sleep and provides a cushioning feeling of first-class luxury. enjoy head-to-toe sleeping support — a standard everyday mattress just doesn’t compare. medium-firm triple layer comfort the mattress’s medium-firm memory foam layer adapts to the contours of the body and comfortably conforms to different sleeping positions.the middle layer provides an extra layer of cushioning support. its design includes breathable air holes, allowing air to circulate inside the mattress. the bottom layer of hard foam offers durability, added stability, and enhanced body support. easy setup and delivery after being pressed, rolled, and vacuum-sealed, the jingwei medium-firm memory foam mattress can be easily carried and delivered right to your door. open the box, and the mattress expands to its ready-to-use size. certipur-us & oeko-tex certified 100 soft and strong, the mattress is certipur-us and oeko-tex 100 certified, which means it has been tested for harmful substances and is non-toxic.