With Zulu PFX, Lightspeed Aviation has leveraged cutting edge technology, world-class engineers, and superior customer knowledge to leapfrog the competition and produce the world's quietest premium ANR headset for aviators. Lightspeed's proprietary PFX technology creates a uniquely personal flying experience by actively conforming to your ears, your environment, and your preferences. Streaming Quiet™ dynamic ANR continuously adapts to your environment, extending the amount, consistency, and frequency range of noise cancellation. Acoustic response mapping measures your unique auditory landscape, adapting the audio response to your ear shape and size for maximum noise attenuation, voice clarity, and music fidelity. Personal preferences can be set using the enhanced capabilities in FlightLink, the proprietary app developed by Lightspeed.