Low　dimensional　semiconducting　structures　with　strong　spin-orbit　interaction　(SOI)　and　induced　superconductivity　attracted　great　interest　in　the　search　for　topological　superconductors.　Both　the　strong　SOI　and　hard　superconducting　gap　are　directly　related　to　the　topological　protection　of　the　predicted　Majorana　bound　states.　Here　we　explore　the　one-dimensional　hole　gas　in　germanium　silicon　(Ge-Si)　core-shell　nanowires　(NWs)　as　a　new　material　candidate　for　creating　a　topological　superconductor.　Fitting　multiple　Andreev　reflection　measurements　shows　that　the　NW　has　two　transport　channels　only,　underlining　its　one-dimensionality.　Furthermore,　we　find　anisotropy　of　the　Lande　g-factor　that,　combined　with　band　structure　calculations,　provides　us　qualitative　evidence　for　the　direct　Rashba　SOI　and　a　strong　orbital　effect　of　the　magnetic　field.　Finally,　a　hard　superconducting　gap　is　found　in　the　tunneling　regime　and　the　open　regime,　where　we　use　the　Kondo　peak　as　a　new　tool　to　gauge　the　quality　of　the　superconducting　gap.