Abstract: A hand, wrist and/or lower arm support pad and related assemblies are disclosed for use by operators of typewriter or computer keyboards, ten key pads and/or various computer peripherals such as a trackball or computer mouse. The support pad includes an enclosure defining a containment area having a flowable material therein and structure to assure retention of the enclosure at a selected location. The retention structure may be integral to the enclosure and/or may be associated with related assemblies. The flowable material preferably exhibits fluid-like characteristics, and, more preferably, is characterized by a non-constant shear rate to shear stress ratio. In some embodiments, it is preferred that the material will not flow under its own weight (i.e., no, or substantially reduced, cold flow characteristics).