Head Strap for Eyewear

FIG. 1 is an upper left front perspective view thereof; FIG. 2 is a front side elevation view thereof; FIG. 3 is a back side elevation view thereof; FIG. 4 is a right side elevation view thereof; FIG. 5 is a left side elevation view thereof; FIG. 6 is a top plan view thereof; FIG. 7 is a bottom plan view thereof; and, FIG. 8 is another perspective view. The short dashed broken lines shown in the figures depict portions of the head strap for eyewear that form no part of the claimed design. The dash-dot-dot broken lines depict the boundaries of the claim and form no part of the claimed design. The long dashed broken lines shown in FIG. 8 depict environment and form no part of the claimed design.