The ornamental design for the tread for a footwearoutsole, as shown and described.
FIG. 1 is a first perspective view of my ornamental design for a tread for a footwear outsole;
FIG. 2 is a second perspective view thereof;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a left side elevation view thereof;
FIG. 5 is a front elevational view thereof;
FIG. 6 is a rear elevational view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines in the figure views depict unclaimed subject matter and environment in the form of a footwear midsole and upper. The broken lines and subject matter they depict form no part of the claimed design.