The Restonic Ashbury Twin XL Mattress Set delivers a great night sleep with the Firming Comfort Layers. The 390 Bonnell Innersprings are tempered coils with SpiraLok that create a stronger and more stable mattress while also reducing motion transfer and body impressions. With the Airflow Fiber, heat dissipates away from the surface so you have an ideal sleep temperature. The set includes a mattress and foundation. Rest easy when you bring this set home!