Hair straightener

[0001]FIG. 1 is a front, right and top perspective view of a hair straightener, showing my new design;

[0002]FIG. 2 is a rear, left and bottom perspective view thereof;

[0003]FIG. 3 is a front view thereof;

[0004]FIG. 4 is a rear view thereof;

[0005]FIG. 5 is a left side view thereof;

[0006]FIG. 6 is a right side view thereof;

[0007]FIG. 7 is an enlarged top plan view of the hair straightener;

[0008]FIG. 8 is an enlarged bottom plan view of the hair straightener;

[0009]FIG. 9 is an enlarged view of a portion of the hair straightener shown within the area designated as 9 in FIG. 1; and,

[0010]FIG. 10 is an enlarged view of a portion of the hair straightener shown within the area designated as 10 in FIG. 1.

[0011]The broken lines shown in the drawings illustrate portions of the hair straightener that form no part of the claimed design.

[0012]The dot-dash broken lines depict the boundaries of the enlargements that form no part of the claimed design.