I claim the ornamental design for a mountain sport equipment, as shown and described.
FIG. 1 is a perspective view of a first embodiment of a mountain sport equipment showing my new design; the broken lines are for illustration purposes only and form no part of the claimed design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof; and,
FIG. 4 is a side elevational view thereof.
The broken lines are for illustration purposes only and form no part of the claimed design.