Shrink Selection

This command shrinks the selection by deselecting all points, edges or polygons (depending on which mode you are in) at the edge of the selection.

If the polygon is closed (for example, a sphere) and you select all polygons, you cannot shrink the selection since it has no edge.

At left the original selection; at right after using Shrink Selection

This function can also be used on selected UV points and polygons.