FIG. 1 is a front elevational view of an arm protector showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a reduced-scale rear elevational view thereof;

FIG. 7 is a rear perspective view in position of use; and

FIG. 8 is a front perspective view thereof.

The broken line showing of a hand in FIGS. 7 and 8 is for illustrative purposes only and forms no part of the claimed design.