An ornamentaldesign for a boot, as shown and described.
FIG. 1 is a perspective view of an ornamental design for a boot according to the invention;
FIG. 2 is a side view of an ornamental design for a boot according to the invention;
FIG. 3 is a reverse side view of an ornamental design for a boot according to the invention;
FIG. 4 is a rear view of an ornamental design for a boot according to the invention.
FIG. 5 is a front view of an ornamental design for a boot according to the invention.
FIG. 6 is a top view of an ornamental design for a padded boot according to the invention; and,
FIG. 7 is a bottom view of an ornamental design for a boot according to the invention.
Broken lines indicate aspects of the environment of the design and form no part of the claimed design. The slashed lines in FIGS. 1-6 correspond to stitching of the boot.