havelock means: A cap with visor that is usually covered by a piece or fabric from the base of your neck to the back of the cap. The cap was originally designed to be worn by soldiers who were stationed overseas in areas where intense sunlight is common. This cap is now available for outdoor and sportswear use, despite recent concern about sunburns. (in Fashion Dictionary)

What else does havelock mean?

Covering cloth for a cap with a flap that covers and protects the back of your neck. (in Merlin Dictionary)