遮阳布
Havelock \Hav"e*lock\, n. [From Havelock, an English general distinguished in India in the rebellion of 1857.] A light cloth covering for the head and neck, used by soldiers as a protection from sunstroke.
havelock n : a cloth covering for a service cap with a flap extending over the back of the neck to protect the neck from direct rays of the sun