FIG. 1 is a bottom perspective view of an outsole for a shoe in accordance with my new design; FIG. 2 is a bottom view thereof; FIG. 3 is a top view thereof; FIG. 4 is a right side view thereof; FIG. 5 is a left side view thereof; FIG. 6 is a front view thereof; and, FIG. 7 is a rear view thereof. The broken lines shown in all of the figures are for environmental purposes and form no part of the claim.