The ornamental design for a glove with a forearmsun protector, as shown and described.
FIG. 1 is a perspective bottom view of a glove with a forearm sun protector, showing my new design;
FIG. 2 is a front view thereof;
FIG. 3 is a rear view thereof;
FIG. 4 is a left side view thereof;
FIG. 5 is a right side view thereof;
FIG. 6 is a top view thereof; and,
FIG. 7 is a bottom view thereof.
All figures illustrate a left hand glove, it is to be understood that the invention includes a right hand glove design which would be illustrated as a mirror images of any or all of the views shown in FIGS. 1 through 7.