Abstract: Helmet Liner Pro system comprises a protective helmet having at least one inner liner for absorbing mechanical energy; and an attachable/attached outer liner comprising shock absorbing material. The attachable outer liner is appliable to an external portion of the protective helmet to provide a shock absorption system whereby a user and others are suitably protected from external impact forces. The shape of the liner may vary depending on whether or not it is covering the entire helmet or just specific areas/portions.