Hair straightener

FIG. 1 is a front, right and top perspective view of a hair straightener, showing our design.

FIG. 2 is a front elevation view thereof.

FIG. 3 is a rear elevation view thereof.

FIG. 4 is a left side elevation view thereof.

FIG. 5 is a right side elevation view thereof.

FIG. 6 is an enlarged top plan view thereof.

FIG. 7 is an enlarged bottom plan view thereof.

FIG. 8 is another front, right and top perspective view of the hair straightener in another state; and,

FIG. 9 is an enlarged view of detail 9 in FIG. 8 .

The broken lines depict portions of the hair straightener that form no part of the claimed design. The dot-dash broken lines in FIGS. 8 and 9 depict the boundaries of the enlargements that form no part of the claimed design.