FIG. 1 is a perspective view of a stool seat;
FIG. 2 is a front view;
FIG. 3 is a back view;
FIG. 4 is a right side view;
FIG. 5 is a left side view;
FIG. 6 is a bottom view; and,
FIG. 7 is a top view.
The details shown in broken lines are for illustrative purposes only, and form no part of the claimed design.