Helmet is wearable at the head of the user to relieve the cervical lesion. Helmet, outer member defining a concave surface; inner member portion is positioned in the concave in at least: and incorporate, the route exercise-induced mechanism, to be bound with respect to the outer member and the inner member. Route exercise-induced mechanism makes it possible to induce relative motion between the inner and outer members depending on the impact force. Constrained to the path predetermined one or more than one, for each of the predetermined path number, the induced relative motion, relative translation between the inner and outer members from one or or I have a rotation.
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