A riding hat can look perfectly fine on the outside and still be past its best on the inside. That is the awkward truth. The shell may be clean, the straps may still fasten, and the lining may feel familiar, but the protective materials can weaken with age, use, heat, sweat, knocks, and changes in safety standards. For most riders, the safest rule is this: replace your riding hat immediately after any significant impact, and replace it routinely every three to five years, dep