The ornamental design for an impact absorbing protective apparatus for a helmet, as shown and described.
FIG. 1 is a front perspective view of the impact absorbing protective apparatus for a helmet showing my new design;
FIG. 2 is a back view thereof;
FIG. 3 is a top view thereof;
FIG. 4 is a left perspective view with the right being a mirror image thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a front view thereof; and,
FIG. 7 is a left side view of my design with the right side view being a mirror image thereof.
The environmental view in FIG. 1 shows my design with a football helmet and face mask in broken lines for illustrative purposes only and forms no part of the claimed design.