Hi i am having problems with my meshes, every single mesh i create the arms "cave in" when the arms move side by side. I made a quick mesh as an example. http://gyazo.com/4e69a8cad4600ffde71285a015cdf42f http://gyazo.com/03c5c01ae262f7798224ee893c79bed3 http://gyazo.com/6378626def5fd2b98bb5cd816f004105 http://gyazo.com/c9858f3551a551c55266c5e873ceb3f4 I'm not sure if it is my weighting or my building skills so i linked the blender file. Sweater blender file