The ornamental design for a balaclava, as shown and described.
FIG. 1 is a perspective view of a balaclava of my new design;
FIG. 2 is a front side elevational view of FIG. 1;
FIG. 3 is a rear side elevational view of FIG. 1;
FIG. 4 is a right side elevational view of FIG. 1;
FIG. 5 is a left side elevational view of FIG. 1;
FIG. 6 is a top plan view of FIG. 1; and,
FIG. 7 is a bottom plan view of FIG. 1.
The facial features of the partial human figure outlined by broken lines assist to portray the balaclava in a position of use and forms no part of the claimed design. The star outlined by broken lines depicts a feature of the balaclava that is not claimed. The stripes outlined by broken lines, as well as the broken line that follows the perimeter opening of the balaclava define portions of the article that form no part of the claimed design.