A heater shield has no fixed lifespan because durability depends on impact frequency, fighting style, construction, and maintenance. MedievalExtreme shields use a wooden or plywood core, fabric covering, and a reinforced leather edge with hidden rope. An additional plywood layer is available for demanding use. Inspect the leather or rawhide edge, straps, core, and fasteners before every event. Replace the shield if cracks or unsafe exposed areas appear.