The ornamental design for a mitten, as shown and described.
FIG. 1 is a top/front/left side perspective view of a mitten showing my new design.
FIG. 2 is a top plan view of the mitten of FIG. 1.
FIG. 3 is a bottom plan view of the mitten of FIG. 1.
FIG. 4 is a left side elevation view of the mitten of FIG. 1.
FIG. 5 is a right side elevation view of the mitten of FIG. 1.
FIG. 6 is a front elevation view of the mitten of FIG. 1.
FIG. 7 is a rear elevation view of the mitten of FIG. 1; and,
FIG. 8 is a top plan view of the mitten of FIG. 1 with a portion of the mitten shown in an alternate position.
The horizontal broken line shown on the mitten in FIGS. 3 and 5 is a feature of the article to which the design is applied that forms no part of the claimed design. The broken-line oval in FIG. 7 which defines the bounds of the claimed design forms no part thereof.