The ornamental design for a dualmaterialtowel, as shown and described.
FIG. 1 is a top elevation view of a dual material towel showing my new design, the bottom being identical to the top;
FIG. 2 is a left side elevation view of the dual material towel of FIG. 1, the right side being identical to the left side;
FIG. 3 is a front elevation view of the dual material towel of FIG. 1; and,
FIG. 4 is a rear elevation view of a the dual material towel of FIG. 1.
The broken lines shown in the drawing figures are for illustrative purposes only and form no part of the claimed design. The surface shading on the rear section of the dual material towel is being used to indicate that a surface is present and also to indicate that the rear section is a first material. The lack of surface shading on the front knobbed section of the dual material towel is being used to indicate that the front knobbed section is a second material different from the first material.