Abstract: The invention relates to an internal protection device for a helmet (2) comprising a hard outer shell (4), a flexible inner cap (6) arranged inside the shell (4), and a chain of air cushions (8) designed to be placed inside the helmet (2), between the head that is to be protected and the flexible inner cap (6). The flexible inner cap (6) comprises a layer of thickness (E) within which there is created a plurality of cavities (100-n) of which the shape, number, respective depth (P) and arrangement are chosen, dimensioned and combined with the air cushions (10-n) so as to improve the shock absorbing properties of the helmet and cover the parts of the user's head that are to be protected when the air cushions (8) are filled with air, while allowing simple removal from the helmet when the air cushions are deflated.

Abstract: The invention relates to an internal protection device for a helmet (2) comprising a hard outer shell (4), a flexible inner cap (6) arranged inside the shell (4), and a chain of air cushions (8) designed to be placed inside the helmet (2), between the head that is to be protected and the flexible inner cap (6). The flexible inner cap (6) comprises a layer of thickness (E) within which there is created a plurality of cavities (100-n) of which the shape, number, respective depth (P) and arrangement are chosen, dimensioned and combined with the air cushions (10-n) so as to improve the shock absorbing properties of the helmet and cover the parts of the user's head that are to be protected when the air cushions (8) are filled with air, while allowing simple removal from the helmet when the air cushions are deflated.