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Part of the reason for the Behemoth's sound-reducing qualities and pitch lowering is the internal felt lining. This is made of the same material as Valenki, which is the classic Russian winter felt boot - a solution true to our essence, it has proven remarkably effective at increasing the Behemoth's performance.
While vital for its sound-dampening capabilities, after many shots, the inner lining might begin to wear. To keep the Behemoth to the max performance changing the inner felt after extended use is a good idea.