FIG. 1 is a side elevational view of one side of a sandal upper showing my new design;

FIG. 2 is a side elevational view of the other side of the sandal upper shown in FIG. 1;

FIG. 3 is a front elevational view of the sandal upper shown in FIG. 1;

FIG. 4 is a rear elevational view of the sandal upper shown in FIG. 1; and,

FIG. 5 is a top plan view of the sandal upper shown in FIG. 1.

The broken line showing of a shoe sole is for illustrative purposes and forms no part of the claimed design.