Large Forces due to impact such as vehicle crash and dropbox could be reduced by energy absorbers. The design of an energy absorber that is consistent with the physical conditions of the problem, is capable of absorbing high energy and economically feasible is a big challenge for the researchers. The purpose of this project is to design an energy absorber for the fall of a simple example of a human-containing capsule. This design includes type, material, geometric dimensions and absorbent layout. To this end, the use of elastomeric cables to absorb energy has been studied as a new idea. Among the studied elastomers, thermoplastic polyurethane was more suitable for energy absorption than other elastomers. In the following, a linear visco-hyperelastic model was selected to express the behavior of material with strain rate dependency at the high strain rate conditions. The tensile test was used to obtain material behavior at low strain rates and at high strain rates tensile weight drop test was used. The data of tensile weight drop test was extracted with image processing method. There was no possibility to directly extract the coefficients of the material model from experimental data. For this reason, tensile test and weight drop test were simulated by finite element method in Abaqus software, and the coefficients of the material model were optimized so that the simulation results match the experiment data of the test. The optimization was performed using Isight and Hooke-Jeeves optimization method. To simplify the optimization process, hyperelastic coefficients were first optimized using the tensile test, and at the next step, taking into account the tensile test and tensile weight drop test data, simultaneously, the linear viscoelastic coefficients were optimized. The verification of the model was carried out using the weight weight drop test data at a lower elevation. the maximum displacement was estimated with error of about 11%. Finally, the drop of the simplified human-capsule model was simulated in three main directions by the finite element method in Abaqus software. The inner box with human was simulated as a rigid body weighing 100 kilograms. The constraints that limit the problem are the maximum permitted acceleration for humans in each direction and the maximum possible displacement with respect to the distance between the outer box and the inner box. The geometric dimensions and layout of the cables were optimized so that the safe height of the critical state reached its highest level. The results showed that if the capsule falls from a height of 3.14 m in any directions, the human in the capsule will remain safe. Keywords: Human-capsule drop, Impact energy absorber, Elastomer, Linear visco-hyperelastic model, High strain rate behavior, Optimization