Neck Pillow

FIG. 1 is a front, right, top perspective view of a neck pillow, showing my new design; FIG. 2 is a rear, left, bottom perspective view thereof; FIG. 3 is a front elevational view thereof; FIG. 4 is a rear elevational view thereof; FIG. 5 is a left side view of the enlarged scale thereof; FIG. 6 is a right side view of the enlarged scale thereof; FIG. 7 is a top plan view thereof; and, FIG. 8 is a bottom plan view thereof. The dashed broken lines in the figures illustrate portions of the neck pillow that form no part of the claimed design.