Adjustable comfort! Replaces the standard foam seat pad for the Hobie Mirage. Adjust the cushion by adding or releasing air pressure. Like an inflatable camping pad. Has an internal self inflating foam and an air valve through which the pad can be further inflated / deflated to suit the users comfort. Not designed for use on Hobie Mirage Inflatable kayaks. Can be used in combination (stacked) on the standard seat cushion.