chin strap

noun
1.
a strap attached to a hat for passing under the chin of the wearer.
2.
a strap to support the chin in cosmetic facial treatment.
3.
a strap on a bridle or halter that joins the throatlatch and noseband.

Origin:
1865–70

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
Cite This Source Link To chin strap
Example sentences
She carries the helmet by its tough plastic chin strap and as she runs along,
  it bangs against her bare leg.
Tighten the chin strap and consider how the helmet feels.
Make sure that the chin strap fits around your ear and under your chin snugly
  and comfortably.
For a helmet to provide protection during impact, it must have a chin strap and
  buckle that will stay securely fastened.
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