my problem is the following: I've made an object in blender and now I've begun applying material but I've noticed that I've added multiple meshes between the innermost and the outermost. This is quite annoying for the part which should have a glass material (the "vizor" as it is visible in the captures). In fact I've first tried to select face without limit selection to visible but as there is the back of the object which is also selected this have not really worked.
EDIT: Ok I'll try to clarify my issue, I've uploaded another capture, this time only one half of the mesh. As you can see there is multiple inner faces especially in the red rectangle (in the image attached) and those inner faces are those I want to assign material on (or delete all other than to outermost)