The Rycote Windjammer 11 is a synthetic fur cover that offers approximately 50dB of wind-noise reduction, when used over a standard windshield. They fit securely using locking zip fasteners and touch fastener-tabs. The materials used are exceptionally transparent to audio and will remain so if regularly groomed with the brush provided. Each Windjammer fits one specific size of Rycote Windshield. This windjammer fits the Windshield 11 System.