The ornamental design for a hairholder, as shown and described.
FIG. 1 is a perspective view of a hair holder showing our new design;
FIG. 2 is a front view thereof;
FIG. 3 is a back view thereof;
FIG. 4 is a right side view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a top plan view thereof;
FIG. 7 is a bottom plan view thereof;
FIG. 8 is an enlarged view of the portion marked as 8-8 in FIG. 2, and at the same time a sectional view along lines 8-8 from FIG. 6 thereof;
FIG. 9 is a perspective view of the hair holder in condition of use; and,
FIG. 10 is another perspective view of the hair holder in condition of use.
The broken lines inside the boundary of the hair holder in FIGS. 1, 2, 9, and 10 show portions which form part of the claimed design. The additional broken lines in the figures show portions of the hair holder, which form no part of the claimed design.