Surface: The smooth surface of the Elevation Lap Desk measures 19.5 inches wide and 12 inches deep. It is perfectly sized to use a 15.6-inch laptop and a mouse. The flat surface allows for proper airflow. Elevation: Adjust the cushion to elevate the surface and avoid neck strain. The center 1/3 folds up and under the upper cushion, providing elevation for the surface. The cushion hooks into place with two buttons in both positions. Cushion: The cushion on this lap desk is foam-filled and covered with comfortable fabric. When flipped out to elevate the surface, there is a channel through the center of the cushions for some added airflow to keep your lap cool. Additional Features: The Elevation Lap Desk also features an integrated device ledge to keep your work from slipping. The built-in phone slot measures 6.25 inches wide and .75 inches deep. An elastic strap holds papers or a pen in place. Portable: Use your lap desk anywhere. With a built-in carry handle and weighing just 2.2 pounds, you can take it to the office, on a flight, or on a road trip. When not in use it’s easy to slide onto a shelf or into a cabinet for storage.