ANR pioneers. Bose was the first company to introduce active noise reduction headsets (over 20 years ago) and they’ve been innovating ever since. The A20 offers 30% greater noise reduction than conventional aviation headsets.A focus on comfort. A quiet headset isn’t enough these days – it has to be comfortable too. The A20 has numerous features that make it the most comfortable headset we’ve worn, including sheepskin cushions and a unique torsion spring that reduces clamping force.Famo..