From Manufacturer
The WindTech MM-9 Mic-Muff Microphone Windshield is a fitted, fur, microphone windshield designed to reduce ambient wind noise when used with a wide range of consumer and professional microphones. This windshield includes 3/4" fur for maximum wind diffusion. It easily slips over existing windscreens and stays in place with a convenient touch-fastener closure. Moreover, the windshield is acoustically transparent, ensuring no degradation in the quality of your microphone performance.
The Mic-Muff on average provides up to 20db of wind-noise reduction in a 20 mph wind, while producing no negative effect on frequency response. Typically, this windshield can be fitted directly over the foam windscreen that came with your microphone or video camera, but some models may require placement over the microphone alone. For additional performance or as a replacement option, WindTech also offers the SG and BG Series of foam windscreens designed to work in conjunction with Mic-Muff windshields. This model is designed to work with Electro-Voice RE-50 *, Sennheiser MD-42 and MD-46 *, and Shure SM-58 * microphones. It features a spherical shape with 55 x 55 x 40mm dimensions (front x rear x length).
* Microphones designated with an asterisk require Mic-Muff to be place directly over microphone without a windscreen.