Fin assemblies for a variety of watersport boards including wakeboards, sailboards, surfboards and the like. The security element according to the invention has two functional layers which are bonded together by means of a resist layer. One or more lipophilic moieties and one or more hydrophilic moieties are bonded to one or more of the synthons, resulting in the formation of the desired macrocyclic modules. By positioning the defined section adjacent the underside of the wrist and the heel of the hand, the wrist and hand are significantly elevated from the support surface by the cushion, thus improving the comfort of the user of the computer mouse and lessening the likelihood of an ailment such a carpal tunnel syndrome. A horizontal dimension of the ledge increases as the ledge continues from the rear surface to a front of the bowl.