The ornamental design for a coolingtowel, as shown and described.
FIG. 1 is a front perspective view of a cooling towel, shown in use by a user. Broken lines are for illustrative purposes only and form no part of the claimed design.
FIG. 2 is a front plan view of the cooling towel of FIG. 1.
FIG. 3 is a rear plan view of the cooling towel of FIG. 1.
FIG. 4 is a side plan view of the cooling towel of FIG. 1; and,
FIG. 5 is a bottom plan view of the cooling towel of FIG. 1.