Tracheostomy masks are devices that are utilized to deliver oxygen to tracheostomy patients. It is worn around the neck over the trach tube. A tracheostomy is a small opening through the skin in your neck into the windpipe (trachea). A small plastic tube, called a tracheostomy tube or trach tube, is placed through this opening into the trachea to help keep the airway open. A person breathes directly through this tube, instead of through the mouth and nose.