Lightspeed Zulu PFX ANR Aviation Headset (Dual GA Plugs) Ultimate quiet and clarity  The proprietary innovations and advanced features in Zulu PFX work in concert to deliver astounding clarity and the world's quietest headset. Comfort  Based on the LightComfort design made famous by Zulu.2, Zulu PFX features soft ear seals, exceptional fit, and a head-friendly 14 ounces.