It spans the whole area under the mattress and hangs just right with no gaps showing the mattress at the corners. I'm using a blue and green bed spread from the 70's, and bought the dark blue skirt to hide the bed frame. This way it looks clean even when the bed is messed up a little. Color was as expected.
This is a decent bed-skirt - poly/cotton which needs minimal or no ironing after washing. I got the black which looks tailored and sharp with virtually any bed covering, The only thing I failed to notice when ordering is that there is no split at the bottom, so it will not work with a full bed frame that has a footboard. I kept this anyway for our guest room bed which has mattress/box spring on a harvard frame and that worked just fine.