Helmet customizable by variation of inner volume

A method for customizing an inner volume of a helmet to adapt the helmet to a shape of a user's head, said helmet including (a) a head-protective structure comprising an outer surface and an inner surface;

• (b) a head-comfort structure positioned between the inner surface and the user's head;
• and (c) a customization structure positioned between the head-protective structure and the head-comfort structure, said customization structure comprising a thermoplastic envelope, said method comprising:
• defining inner zones of the helmet for which a shape of the user's head requires an increase in volume;
• heating the envelope to a temperature less than 80° C.;
• inserting a dummy head in the heated envelope, said dummy head being adaptable and modifiable to follow more closely the shape of the user's head.

A dummy head comprising:

• an outer surface having a shape of a human skull;
• the dummy head being structured and arranged to be used in a method for customizing an inner volume of a helmet to adapt the helmet to a shape of a user's skull, the helmet including (a) a head-protective structure comprising an outer surface and an inner surface;
• (b) a head-comfort structure positioned between the inner surface and the user's skull;
• and (c) a customization structure positioned between the head-protective structure and the head-comfort structure, said customization structure comprising a thermoplastic envelope, the method comprising:
• (i) defining inner zones of the helmet for which the shape of the user's skull requires an increase in volume;
• (ii) heating the envelope to a temperature less than 80° C.;
• (iii) inserting the dummy head in the heated envelope;
• the dummy head comprising a plurality of adjustable elements structured and arranged to be repositioned to follow more closely the shape of the outer surface of the user's skull.