Wind-shield

A mechanical acoustically-transparent screen placed in front of or completely enveloping a microphone to prevent moving air currents from impacting the diaphragm and generating unwanted noise. In studio use a wind-screen is typically used to prevent plosive blasts from vocals or speech reaching the mic diaphragm, and it's typically a large disc made of a two layers of mesh fabric, a perforated metal disc, or an open-cell foam disc. In location sound gathering applications a wind-shield is typically a large fabric-covered frame which completely envelopes the microphone with a volume of still 'dead air'.