Soft-touch haptics currently gain importance in numerous applications, among them automotive interiors and various articles of daily use. A lot of parts which require soft touch haptics consist of two plastic components – a rigid structural component covered by a soft component providing the desired feeling. Besides common 2K injection molding, co-injection molding represents another approach to produce parts containing a hard and a soft component. In the process of co-injection molding (also called sandwich injection molding) two melts are injected into the mold sequentially: At first the skin material is injected and freezes at the cold mold wall partially. Secondly the core material is injected into the mold. The core material solidifies between the formed skin layers [1] [2]. To further reduce the material usage and thus the weight of such co-injected parts, foam injection molding can be employed [3]. In this work, co-injection molding with a foamed core is combined with a soft-touch skin layer based on TPE. Three grades of thermoplastic elastomers have been chosen. Different grades of polypropylene and polyamide are evaluated as structural component. The foaming of the core component is done using a MuCell® equipment and the physical foaming agent N2. The aim of this work is to understand the influence of the processing parameters on the morphology of the co-injected parts. A demonstrator part having a nearly circular cross-sectional area with a diameter of 40 mm is considered in this study. The processing parameters are systematically varied when producing demonstrator parts. The resulting morphology is investigated and characterized employing light microscopy. The skin to core-ratio as well as the foam morphology (cell size and cell size distribution) are evaluated. Crucial process parameters turned out to be injection speed, injection temperature as well as core content.