Sidi Hyper Extension Block System

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The Sidi Hyper Extension Block System is a vital replacement part for Crossfire 3 SRS boots, designed to prevent hyperextension of the ankle, instep, and posterior tendon during in tense rides. Featuring a two-piece construction, this system enhances protection without compromising flexibility. Easy to install, it ensures your boots maintain their advanced protective features, helping to prevent injuries during off-road and motocross adventures. Fits Crossfire 3 SRS models Advanced hyperextension prevention technology Provides safety without limiting flexibility Comes with installation screws and attachments Show more