38W x 74D x 8H Why worry when you can chime With the Sierra Sleep Chime innerspring twin mattress you have endless possibilities for restful sleep Feel the support of a truly traditional coil mattress which contours to your body for a traditional feel High density quilt foam and pad provide the firm feel you love Hypoallergenic material makes it ideal for sufferers of allergies for ultimate undisturbed sleepnot to mention peace of mind Plus this mattress arrives in a box for quick and easy setup Simply bring it to your room remove the plastic wrap and unroll Youll be amazed at how it fully expands within minutes Foundationbox spring available sold separately