conforms to the contours of the user 39 s head when cured by cooling the liner assumes a rigid construction that by custom fitting repeatably aligns the helmet shell to the head of the user and is crushable to absorb energy application_number US 53477990 A description turning now to the figures and in particular fig1 there is illustrated a helmet system utilizing a helmet liner constructed according to the teachings of the present invention designated generally with the reference numeral 10 the helmet system 10 is shown as comprising a helmet shell 12 which would normally be fabricated from multiple laminations of a composite material such as sold those fabricated from a product sold under the trademark kevlar and or similar composite materials while a principal function of the shell is to protect the wearer 39 s head it can also operate as a mounting point for such devices as for example precision optics systems not shown that require accurate alignment of the shell and the mounted optics with the wearer 39 s eyes mounted within the helmet shell 12 for placement between the interior surface of the helmet shell 12 and a wearer 39 s head not shown is a liner combination 14 illustrated in phantom in fig1 as perhaps better illustrated in the partial sectional view of the helmet system 10 in fig3 the liner combination comprises an energy absorbing liner 14a located adjacent the interior surface of the helmet shell 10 and an inner comfort liner 14b located to be positioned next to the head not shown of the wearer the energy absorbing liner 14a is mounted to and held in place in the helmet shell 12 by a removable adhesive system such.