Areas in the down-skin type do not have any further exposed layer below.
Down-skins can be exposed with hatch, fill contour, or border vector types.
| Vector Type | Description |
| Hatch (down-skin) | Hatches fill the inner area of the respective area of the down-skins. |
| Fill contour (down-skin) | A fill contour is a hole-filling contour between a border (down-skin) and the hatches (down-skin). |
| Border (down-skin) | A border is a contour on the outer area of the part that surrounds the hatches (down-skin). |