We claim the ornamental design for a towel, as shown and described.
FIG. 1 is a perspective view showing our new design for a towel.
FIG. 2 is a top view of our new design shown in FIG. 1; and,
FIG. 3 is a cross-sectional view take along the 3—3 in FIG. 2.
The broken lines are for environmental purposes only and form no part of the claimed design.