A collar for protecting the neck of a user, useful in particular for motorcycle riders, is envisaged, said collar comprising two half-collars which are pivotably hinged together at one end so as to be rotatable in a substantially horizontal plane and which can be connected together by means of a fastening and release lever, a safety structure which at the rear extends downwards from the bottom edge of the collar so as to be centered with respect to the spinal column of the user, and a protective shield which extends downwards at the front. The safety structure has a breakable structure made of the material with an impact strength lower than the material forming the collar so as to break in a programmed manner in the event of impacts following falls.
