The design is the visual features of the TOWEL shown in solid lines in the drawings, whether those features are features of one of shape, configuration, ornament or pattern or are a combination of any of these features.Fig. 1 is a front view of a first variant of the towel;Fig. 2 is a top view of the first variant of the towel;Fig. 3 is a bottom view of the first variant of the towel;Fig. 4 is a first side view of the first variant of the towel;Fig. 5 is a second side view of the first variant of the towel;Fig. 6 is a perspective view of the first variant of the towel;Fig. 7 is a front view of a second variant of the towel;Fig. 8 is a top view of the second variant of the towel;Fig. 9 is a bottom view of the second variant of the towel;Fig. 10 is a first side view of the second variant of the towel;Fig. 11 is a second side view of the second variant of the towel;Fig. 12 is a perspective view of the second variant of the towel;Fig. 13 is a front view of a third variant of the towel;Fig. 14 is a top view of the third variant of the towel;Fig. 15 is a bottom view of the third variant of the towel;Fig. 16 is a first side view of the third variant of the towel;Fig. 17 is a second side view of the third variant of the towel;Fig. 18 is a perspective view of the third variant of the towel;Fig. 19 is a front view of a fourth variant of the towel;Fig. 20 is a top view of the fourth variant of the towel;Fig. 21 is a bottom view of the fourth variant of the towel;Fig. 22 is a first side view of the fourth variant of the towel;Fig. 23 is a second side view of the fourth variant of the towel;Fig. 24 is a perspective view of the fourth variant of the towel;Fig. 25 is a front view of a fifth variant of the towel;Fig. 26 is a top view of the fifth variant of the towel;Fig. 27 is a bottom view of the fifth variant of the towel;Fig. 28 is a first side view of the fifth variant of the towel;Fig. 29 is a second side view of the fifth variant of the towel;Fig. 30 is a perspective view of the fifth variant of the towel;Drawings of the design are included.