earmuff

/IH1 R M AH0 F/
noun
  1. 1

    A garment to keep the ears warm.

  2. 2

    A garment or part worn over a single ear.

  3. 3

    A sound-deadening cup or a pair of such cups worn over the ear or ears.

noun
  1. 1

    Objects designed to cover a person's ears for protection against cold or noise. They consist of a thermoplastic or metal head-band, that fits over the top of the head, and a pad at each end, to cover the external ears.

Source: https://en.wiktionary.org/wiki/earmuff, https://en.wiktionary.org/wiki/earmuffs