FIG. 1 is a top left perspective view of a helmet showing the new design;
FIG. 2 is a right side elevational view thereof, the left side being a mirror image;
FIG. 3 is a front end elevational view thereof;
FIG. 4 is a rear end elevational view thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The broken line showing of interior structure is included for the purpose of illustrating environment and forms no part of the claimed design.