The continuum mechanics view of rubber and rubber-like materials requires material laws which allow the description of their extremely large reversible deformations. A well known approach to solve this problem consists in using appropriate elastic material laws. For applications including effects like hysteresis and influence of the history of deformations, a recently developed inelastic material law is presented. This material description is based on phenomenological considerations it contains eight material-specific constants and shows a very good agreement with extensive tensile and shear measurements. Furthermore, it is shown how to implement this material law in a Lagrangian FEM-program.