The Sennheiser MZH 20-1 is a specialized "long hair" wind muff designed to provide maximum wind noise protection for shotgun microphones when used with the Sennheiser MZW20-1 blimp-style windshield system. This accessory, often referred to as a "dead cat" or "windjammer," is constructed from long synthetic fur fibers attached to a stretchable fabric base. Its purpose is to dramatically reduce the low-frequency rumble and buffeting sounds caused by wind moving across the microphone's diaphragm, which is a critical challenge for outdoor film, broadcast, and location sound recording. The long fibers work by disrupting and slowing down air currents before they reach the rigid foam basket of the blimp, effectively dissipating their energy. The "B-Stock" designation indicates the item has been inspected and certified to perform like new, often at a reduced price, though it may show minor cosmetic signs of prior use.

The MZH 20-1 is specifically tailored to fit securely over the MZW20-1 blimp, which houses shotgun microphones like the Sennheiser MKH 416 or similar models. It typically attaches via an elastic band or a zipper system that ensures a snug, non-slip fit even in strong winds. The design is optimized to not touch the internal windscreen or microphone, preventing the transmission of noise from the fur moving against the blimp. While essential for outdoor recording, this wind muff is bulky and is generally used only when wind conditions demand it, as it can slightly attenuate the highest frequencies; for calm conditions or indoor use, the blimp alone is usually sufficient. Its lightweight construction ensures it doesn't significantly alter the balance of the boom pole or shock mount system.

For professional sound recordists working in unpredictable outdoor environments, the MZH 20-1 is an indispensable tool. It enables the capture of clean, usable dialogue and ambient sound in conditions that would otherwise render audio unusable due to wind noise. By pairing this high-performance wind muff with a quality blimp and shotgun microphone, audio professionals can achieve broadcast and film-quality sound even in challenging weather, ensuring their recordings meet the highest production standards. The B-Stock option makes this professional-grade wind protection more accessible without compromising on performance.