Attachment to a Helmet to Stop It From Falling Off

This page is the CodyCross answer for the clue below from Under the sea, Group 39, Puzzle 1.

Question is: Attachment to a Helmet to Stop It From Falling Off

and the answer is: CHINSTRAP

Word Meaning:

CHINSTRAP — A strip of leather or material used to fasten a hat or helmet under the chin.

Definitions from Wiktionary.