Stepping out of the bath with wet feet on a cold floor is not only uncomfortable, it can also be dangerous. Bath mats and runners let you step onto a nice plush dry surface. The advantage of mats with rubber backings is that they are not likely to slip. The advantage of towel-style cotton runners is that they are easy to clean. You just throw them into the wash like you would a towel. Chose the type that is right for you.
Bath Runner Mats:
Bath Runner Mats pictured: Sleep Innovations 24-Inch by 60-Inch Memory Foam Runner.
Of course, these come in all sorts of colors.