A directional pile created by the short fuzzy ends of fibers on the surface of cloth projecting upward from the lie and which create a favorable and unfavorable direction for rolling balls. The convention in most billiards games in which directional nap cloth is used is to brush the cloth along the table in the same direction of the nap , usually from the end that a player breaks. In snooker and UK eight-ball especially, this creates the effect of creep in the direction of the nap , the most-affected shot being a slow roll into a center pocket against the nap . It is commonly referred to in the fuller term "nap of the cloth ." When nap is used in relation to woven cloths that have no directional pile, such as those typically used in the U.S. for pool tables, the term simply refers to the fuzziness of the cloth .