Flexible material part (20) for the helmet interior (12) of a helmet (10), the flexible material part (20) having a flexible head part (21) and at least three fixing means (22, 23) connected to it and being suitable for use with the helmet interior ( 12) or to be connected to the helmet body (11) of the helmet (10) at at least three points with the aid of the fixing means (22, 23), at least one of the fixing means (22) being a means for continuously or steplessly variable adjustment of the position of the having flexible material part (20) within the helmet (10).
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