Hair Drying Cap

FIG. 1 is a perspective view of a hair drying cap showing my new design; FIG. 2 is another perspective view thereof; FIG. 3 is a front view thereof; FIG. 4 is a back view thereof; FIG. 5 is a left view thereof; FIG. 6 is a right view thereof; FIG. 7 is a top plan view thereof; FIG. 8 is a bottom plan view thereof; and, FIG. 9 is a partial enlarged view of portion 9 in FIG. 1 . The evenly spaced broken lines in the drawing depicting portions of the hair dryer cap are for illustrative purposes only and form no part of the claimed design. The dash-dot-dash broken lines indicating the enlarged views in the drawings are for annotative purposes only and form no part of the claimed design.