Lightspeed's Performance Ear Seals fit all current Lightspeed headset models (Zulu Series, Sierra, and Tango) as well as the PFX, and are designed to hug the curve of the jaw, creating a more natural fit that increases your comfort and stability. This standard head pad comes with the Tango wireless and Sierra headsets. The wind screen (mic muff) fits all current Lightspeed Zulu Series, Sierra, Tango and PFX headset models. All Lightspeed headset mics are calibrated for use with a wind screen.