Sallet

n. [Fr. salade, Sp. celada, It. celata, W. saled, from Lat. cælata, cassis cælata, from cælure, to engrave in relief; so called from the figures engraved upon it.] A light kind of helmet, introduced during the fifteenth century, chiefly for the use of foot-soldiers.

Then he must have a sallet wherewith his head may be saved.