FIG. 1 is a bottom perspective view of a boot tread showing my new design, the broken lines showing a boot being for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a left side elevational view thereof, the right side being a mirror image;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is a rear elevation view thereof;

FIG. 6 is a left side elevational view of an alternate embodiment of the design shown in FIG. 1, the only difference being the striated toe, instep and heel; and,

FIG. 7 is a bottom plan view of the second embodiment shown in FIG. 6.