Compressive stress-strain properties of closed-cell microcellular EPDM rubber vulcanizates with and without a filler were studied with the variation of density. For filler variation studies, silica and carbon black (N330) were used. With a decrease in density, the stress-strain curve for microcellular EPDM behaves differently from that for the solid vulcanizates : The curve rises steeply when cell breakdown occurs. The compressive stress-strain properties are found to depend on the strain rate. The compression set at constant stress increases with decreasing density. The energy-absorption behavior was studied from the compressive stress-strain properties. The efficiency, E, and ideality, I, parameters were also determined as they are useful for the evaluation of closed-cell microcellular rubber as a cushioning and packaging material. These parameters were plotted against stress to find the maximum efficiency and maximum ideality region which will make these materials suitable for cushioning or packaging applications.